An ecosystem is Multiple choice question. a collection of different species that interact. a group of populations in a given area. a community with all the living and nonliving components. another term used for a community.
Answer:
a community with all the living and nonliving components
Explanation:
All of the following statements are true for exothermic chemical reactions EXCEPT _______.
Exothermic reactions may give off heat
Exothermic reactions may give off light
Exothermic reactions may increase the temperature of the surroundings
Exothermic reactions may decrease the temperature of the surroundings
Answer:
Exothermic reactions may decrease the temperature of the surroundings.
Explanation:
Endothermic reactions take in heat from the environment, so they may decrease the temperature of the surroundings.
Phenytoin blocks the opening of voltage-gated na channels in neurons. therefore, this action has its primary effects on which part of the neuron?
Numerous antiepileptic medications, such phenytoin, have been designed to block voltage-gated sodium channels (VGSC) in neuronal membrane. In addition, multiple toxins and pharmacological modulators work by attaching to various biophysical states of the VGSC to cause their effects. Depending on how modulatory agents act, some VGSC states are stabilized or destabilized, altering the channel's biophysical properties. The first anticonvulsant to successfully treat epileptic disorders without causing undesirable side effects such as brain drowsiness was phenytoin.
Phenytoin has been indicated to block high-frequency neuronal activity potentials from the inner vestibule of the pore, as demonstrated by electrophysiological research and site-directed mutation.
Frequency and voltage both affect phenytoin binding.
There are theories that phenytoin interferes with the late sodium current that sustains depolarizations in epilepsy by blocking non-inactivated channels.
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Stubble bristles (Sb) is dominant to wildtype bristles (Sb+) in Drosophila melanogaster. In a population where there are 137 flies with wildtype bristles and 836 flies with stubble bristles, what are the allele frequencies for the Sb and Sb+ alleles (assuming the population is in Hardy-Weinberg equilibrium)? Please calculated your answers to 3 decimal places.
f(Sb)=
f(Sb+)=
If the population is in Hardy-Weinberg equilibrium, what proportion of the population would you expect to be heterozygous?
Populations in H-W equilibrium have the same allelic and genotypic frequencies generation after generation. f(Sb) = p = 0.626. f(Sb+) = q = 0.374. F(SbSb+) = 2pq = 0.468
What is Hardy-Weinberg Equilibrium?
The Hardy-Weinberg equilibrium is a theory that states that, assuming a diallelic gene,
⇒ The allelic frequencies in a locus are represented as p and q.
• The frequency of the dominant allele p(X) is p
• The frequency of the recessive allele p(x) is q
⇒ The genotypic frequencies after one generation are
• p² (Homozygous dominant genotypic frequency),
• 2pq (Heterozygous genotypic frequency),
• q² (Homozygous recessive genotypic frequency).
Allelic and genotypic frequencies remain the same through generations in a population that is in H-W equilibrium.
The addition of the allelic frequencies equals 1
p + q = 1.
The sum of genotypic frequencies equals 1
p² + 2pq + q² = 1
In the exposed example,
Sb is dominantSb+ is recessive ⇒ wild typePopulation size ⇒ 137 + 836 = 973Individuals with wildtype bristles ⇒ 137 ⇒ Sb+Sb+Individuals with stubble bristles ⇒ 836 ⇒ SbSb and SbSb+First, we will get the frequencies.
To do it, we will use the number of individuals. These values will tell us about phenotypic frequencies,
Phenotypic frequency
F(wildtype) = q² = 137/973 = 0.14F(stubble) = p² + 2pq = 836/973 = 0.86Now, we will use the frequency of the recessive phenotype to get its genotypic and allelic frequencies.
F(Sb+Sb+) = q² = 137/973 = 0.14 ⇒ Recessive Genotypic frequency
f(Sb+) = q = √0.14 = 0.374 ⇒ Recessive Allelic frequency
Now, Since this population is in H-W equilibrium, we will use q (recessive allelic frequency) to get the dominant allelic frequency and the dominant genotypic frequency. To do it, we will clear the following equation,
p + q = 1
p + 0.374 = 1
p = 1 - 0.374
p = 0.626 ⇒ Dominant Allelic frequency
F( SbSb) = p² = 0.626² = 0.392 ⇒ Dominant Genotypic frequency
Finally, we will get the heterozygous frequency. There are two options,
To susbtract the dominant genotypic frequency to the dominant phenotpic frequency,F(SbSb + SbSb+) - F(SbSb) = 0.86 - 0.392 = 0.468
To clear the following equation,p² + 2pq + q² = 1
0.392 + 2pq + 0.14 = 1
2pq = 1 - 0.392 - 0.14
2pq = 0.468
Answers:
- f(Sb) = p = 0.626 ⇒ Dominant Allelic frequency
- f(Sb+) = q = 0.374 ⇒ Recessive Allelic frequency
- F(SbSb+) = 2pq = 0.468 ⇒ Heterozygous frequency
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As mean arterial pressure increases, the ________, informing the medulla oblongata that blood pressure has indeed increased.
As mean arterial pressure increases, the frequency of action potentials from the baroreceptors increases, informing the medulla oblongata that blood pressure has indeed increased.
Special receptors called baroreceptors monitor variations in your blood pressure. The aorta and carotid sinus both contain significant baroreceptors. The walls of the arteries stretch when the blood pressure in the aorta or carotid sinus rises, stimulating an increase in baroreceptor activity.Action potentials are more quickly fired when baroreceptors are activated, with the speed being inversely correlated with the mechanical stretch.The brain interprets the information that the baroreceptors send as a rise in blood pressure. The blood vessels, heart, and kidneys are just a few of the bodily organs that get signals from the brain to lower blood pressure.learn more about baroreceptors here: https://brainly.com/question/8963123
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the _______ is the central organ in the circulatory system. it has four chambers.
The complete sentence is "The heart is the central organ in the circulatory system. It has four chambers".
The heart, which pumps blood throughout the body, is an essential part of the circulatory system. It is commonly referred to as the "central pump" or the "central organ" of the circulatory system due to its crucial role in maintaining blood circulation.
The heart, a muscular organ, is located in the chest cavity and leans slightly to the left. Two top chambers, known as atria, and two bottom chambers, known as ventricles, make up the heart.
The two atria of the heart act as its chambers of reception. Both the left and right atriums of the heart receive blood that is returned to the heart by the body. The heart's two ventricles are its pumping chambers. They contract ferociously to force blood out.Thus, the complete sentence is "The heart is the central organ in the circulatory system. It has four chambers".
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Drag each item related to a model of population growth to the appropriate cell in the table. Three cells are completed as examples.
The model of population growth as indicated in the question is completed and attached in the image labelled Growth Model.
What is model of population growth?An species that reproduces according to to set rules has a population that can be predicted by a population growth model.
The model predicts the population at a particular period based on the number of times an organism reproduces, how many new creatures it creates each time, and how often it reproduces.
What are the various models of Population Growth?There is the Exponential Population Growth Model.
When resources are unrestricted, population growth is exponential; the population's rate of change is only dependent on its size.
There is the Logistic population growth Model.
Logistic population growth happens when there are few resources available and competition for those resources;
the population's pace of change depends on the size of the population, the level of rivalry, and the availability of resources.
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Full Question:
Identify Properties Of Population-Growth Models Instruction: Drag Each Item Related To A Model Of Population Growth
See the attached named Attachment 2.
A male stickleback fish attacks other male stickleback fish to protect his property. However, he also attacks models of fish that have a similar red-colored belly. This is an example o
It is an example of Fixed Action Patterns.
What are fixed action patterns?
A fixed action pattern (FAP) is a predetermined set of behaviors that happen in a predetermined order in response to a sign stimulus, which is an external stimulus. The behavior is "fixed" because it is essentially unchanging and behaves consistently among members of a species.
FAPs are inherent, which means that the animal is born with the capacity to engage in the behavior and does not require learning. FAPs are also typically finished after being triggered. The ability to instinctively identify and attack prey or, as in the case of sticklebacks, the ability to produce more young that can survive to adulthood are just two examples of how these behaviors may be crucial to improving an animal's fitness.
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What is a wireless pan technology that transmits signals over short distances among cell phones, computers, and other devices?
Bluetooth is a wireless pan technology that transmits signals over short distances among cell phones, computers, and other devices.
Bluetooth is a wireless technology enormous, used will change records between cell(mobile) gadgets, like smartphones, drugs, headsets, and wearables, over short distances in a one-to-one style (because of this that it is not possible to assemble a network-based totally on Bluetooth).
Bluetooth is a wireless generation that uses a radio frequency to share statistics over a short distance, putting off the want for wires. you may use Bluetooth to your mobile tool to percentage files or to hook up with unique Bluetooth-enabled devices.
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Identical twins are produced from the same sperm and egg (which splits after the first mitotic division), whereas fraternal twins are produced from separate sperm and separate egg cells. If two parents with brown eyes (a dominant trait) produce one twin boy with blue eyes, what are the following probabilities? A. If the other twin is identical, he will have blue eyes. B. If the other twin is fraternal, he or she will have blue eyes. C. If the other twin is fraternal, he or she will transmit the blue eye allele to his or her offspring. D. The parents are both heterozygotes
Answer:
A: 100%
B: 25%
C: 25%
D: 100%
Which muscle is highlighted?
a) flexor digitorum longus
b) tibialis posterior
c) flexor hallucis longus
d) popliteus
The muscle which is highlighted is flexor digitorum longus and is therefore denoted as option A.
What is Flexor digitorum longus?This refers to a deep posterior muscle which is present in the lower leg and is responsible for the different movement of the great toe.
It is also involved in plantar flexion and foot inversion and also helps to maintain a medial longitudinal arch thereby making it the most appropriate choice.
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which of the follwing is evolutionary evidence that whales and dolphins descended from land dwelling mammals'
Transition fossils show the presence of leglike structures, pointing to the possibility that the ancestors of whale and dolphins once lived on land.
The cetaceans, which include whales, dolphins, and porpoises, are descended from land-dwelling mammals. Traces of their terrestrial ancestry can still be seen in the bones of their fins, which resemble enormous, jointed hands, in their vertical spine movement, and in the fact that they must breathe air from the surface.What is evidence that whales evolved from land mammals?
There are several indications from a whale's anatomy and biology indicating they originated on land. They have paddle-shaped flippers that house hand bones with five "fingers," breathe air, and nurse their young with their own milk. Whales have tiny back limbs as embryos, but these vanish before birth.Learn more about dwelling mammals
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Monarch butterfly caterpillars are herbivores of common milkweed. Milkweed produces a sticky latex sap and a toxin in its leaves. How is the interaction between the caterpillars and milkweed characterized
The relationship between the caterpillars and milkweed is characterized by - for the milkweed and + for the caterpillar
The monarch butterfly can only survive if it feeds on milkweed during its whole life cycle. Because monarch butterfly larvae, also known as caterpillars, can only feed on milkweed, this species of butterfly is also known as the "milkweed butterfly."The female monarch butterfly lay her eggs on the bottom of the milkweed leaves, which will offer the developing larvae protection as they grow. The big leaves function similarly to umbrellas, protecting the eggs from the excessive heat of the summer sun and providing cover from the heavy downpours. In addition, the leaves provide a wonderful place to conceal oneself from any predators that might be interested in eating the eggs before the larva hatches. As soon as the eggs hatch, the larvae will begin to feed on the leaves of the milkweed plants. For the first few days of their lives, they will consume food continuously, day and night. The milkweed provides the young caterpillars with more than just food while they develop. Milkweed offers a one-of-a-kind defence against predators to both the monarch butterfly larvae and the adult butterflies. The larvae consume a significant proportion of the milkweed plant's dangerous compounds since the milkweed plant itself contains poisonous elements. As a result, the monarch butterfly themselves become poisonous.
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He surgery for a client scheduled for an 8:00 a.m. procedure is delayed until 11:00 a.m. what is the appropriate nursing action regarding administration of preoperative prophylactic antibiotic?
He surgery for a client scheduled for an 8:00 a.m. procedure is delayed until 11:00 a.m. The appropriate nursing action regarding administration of preoperative prophylactic antibiotic is to adjust the administration time to be given at 10:00 a.m.
The preoperative patient's reports should be made before the surgery like reports of pertinent cardiovascular and respiratory findings (like chest pain, irregular heart rate), reports of any signs or symptoms of infection (like fever, increased white blood cell count), repots from laboratory that could contraindicate surgery (like positive pregnancy test results), reports of other clinical condition that may need further evaluation before surgery (like vomiting, recent intake of an anticoagulant drug).
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what is organ donation?
[tex] \: [/tex]
Organ donation is nothing but the process by which the person donates his/her organ to other person to save the life of a him/her.
Answer:Organ donation is when a person gives a organ of their own to be removed and given to another person.
Explanation:
The high concentration nutrients in sieve tubes causes entry of water through osmosis. It leads to
The high concentration nutrients in sieve tubes causes water to move by osmosis from xylem into the phloem cells.
What is osmosis?Osmosis is the movement of water across a semipermeable membrane as a result of solute concentration gradient.
The The high concentration nutrients in sieve tubes causes entry of water through osmosis. It leads to movement of water from xylem into the phloem cells by osmosis.
In conclusion, osmosis enables movement of water in plants.
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give reason : the root of the chilli is tap root
Answer:
Root system of chilli crop is highly branched with a tap root at centre. Chilli plants withstand drought better than excess soil moisture. Taproots anchor plants deeply, helping to prevent the wind from blowing them over and stabilizing plants that grow in areas of shifting soils such as beaches or sand dunes
Describe how two of the cell structures listed below interact to help maintain a balanced internal environment in a cell.
Cell structures involved releases glucagon to raises the blood glucose levels when the glucose levels in the blood is low
However too, the hormone adrenaline is released to the body's internal environment when there is danger.
What is homeostasis?Homeostasis can simply be defined as the steady maintenance of the internal environment of an organism. Living organisms usually find a way to balance any low or high concentration of substances in the internal environment
Below are what makes up the internal environment of an organism:
BloodLymphIntercellular fluidsSo therefore, cell structures involved releases glucagon to raises the blood glucose levels when the glucose levels in the blood is low
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What type of energy comes from the motion of tiny particles?
chemical energy
light energy
thermal energy
radiant energy
The type of energy that comes from the movement of small particles is thermal energy, as the movement of particles produces thermal energy as a result.
What is it called or particle motion?
Concept Brownian is the random motion of particles in a fluid (liquid) as a consequence of all changes such as the gas or movement of those present in the fluid.
With this information, we can conclude that On the motion of small suspended particles within liquids at rest, as required by the kinetic molecular theory of heat
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Answer:
thermal energy
Explanation:
(b) What are the differences between reproduction in Rhizopus and in maize.
Maize reproduces sexually while rhizopus reproduces both sexually and asexually.
Reproduction in rhizopus and in maizeRhizopus belongs to a group of organisms in the kingdom Fungi. Maize, on the other hand, belongs to a group of organisms in the kingdom Plantae.
Rhizopus is able to reproduce both sexually and asexually. Sexual reproduction is by the fusion of compatible hyphae - one carrying the + strain and the other the - strain.
Asexual reproduction in rhizopus is by the formation of asexual spores - sporangiospores and chlamydospores.
Maize is only able to reproduce sexually. The male gamete in the form of pollen pollinates (fertilizes) the female gamete in the form of ovule or egg. Double fertilization occurs to form a seed coat that nourishes the zygote.
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PLS HELP
What is the phenomenon called that occurs when changes in a protein appear to
accumulate at a constant rate over time?
A)morphological comparison
B) evolution stopwatch
C) molecular clock
D) homologous structure
when changes in a protein appear to accumulate at a constant rate over time is called option (c) i.e, Molecular clock.
What does molecular clock mean?The term "molecular clock" refers to a method that estimates the time in prehistory when two or more life forms diverged by analyzing the mutation rate of biomolecules. Typically, nucleotide sequences for DNA, RNA, or amino acid sequences for proteins serve as the biomolecular data for these calculations.
Hedges, a biology professor at Penn State, claims that the molecular clock counts the mutations that accumulate through time in the gene sequences of various species rather than counting seconds, minutes, and hours.
Mutation and recombination, the two fundamental biological processes that give rise to all heritable variations, are the foundation of molecular clocks. Mutations are modifications to the genetic code of DNA, for as when the nucleotide Guanine (G) turns to Thymine (T).
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mmature B lymphocytes undergo clonal deletion in the bone marrow. Group of answer choices True False
True, Immature B lymphocytes undergo clonal deletion in the bone marrow.
What are immature B lymphocytes? How does it undergo clonal deletion in the bone marrow?
In the bone marrow and thymus, lymphocytes are born. The names of T cells and B cells come from the organs in which they are born. T cells form in the thymus, whereas B cells form in the bone marrow of adults or the liver of fetuses in mammals.
Most mammals' bone marrow is where immature B lymphocytes are made. The B cell will die via apoptosis, also known as a clonal deletion if it fails at any stage of the maturation process. Positive selection is used in this situation. Negative selection is also used to check the autoreactivity of B cells. These B cells will perish through clonal deletion if they have a high affinity for attaching to self-antigens. In the bone marrow, immature B cells that bind self-antigen perish because they are highly susceptible to antigen binding.
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[TG.04]One student designed an experiment to demonstrate the formation of a geologic feature. The steps of the experiment are listed below.
• Place a rectangular piece of cardboard on a table.
Cut a strip of paper one inch long and half an inch wide.
Place the paper strip on the cardboard along one of its edges.
• Use a clip to attach the middle of the paper strip to the cardboard so that approximately half of the paper strip is on each side of the clip.
Place one hand on each of the two halves of the paper strip.
• Push both ends of the paper strip towards the clip.
. Observe the formation of ripples on the paper.
Which of these geologic features was created by the process demonstrated by the student's experiment?
A) the Big Island of Hawaii
B) the Grand Canyon
C) the Himalayan mountain range
D) the Sierra Nevada Mountains
B) The Himalayan Mountain range of geologic features was created and demonstrated by the student's experiment.
In the northeastern corner of India, there are mountains called the Himalayan mountain range. They go 1,500 miles (2,400 km) and cross through China, Bhutan, Nepal, Pakistan, Afghanistan, and India. The Himalayan Mountain range is known for its extreme height, intricate geological structure, snow-covered peaks, sizable valley glaciers, deep river gorges, and lush vegetation.
The Himalayan mountain range is the tallest mountain range in the globe and is home to Mount Everest and nine out of the ten highest peaks in the world. These mountains, sometimes known as the Third Pole, are the source of several of Asia's major rivers and have a role in controlling the climate of the world.
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Vessels and Nephron Components Place each label in the correct box, indicating whether it is a component of a nephron or a component of the renal vasculature.
The label match up are:
Part of the nephron are:
Proximal convoluted tubulesDistal convoluted tubulesRenal corpusclesNephron loopsComponent of Renal vasculature are:
Afferent arteriolesRenal arteries and veinsPeritubular capillariesWhat is nephron and its function?The nephron is known to be a form of a structural and functional component of the kidney.
It functions as it helps one to be able to monitor or regulates the amount of concentration of water and minerals .
Note that in the case above, The label match up are:
Part of the nephron are:
Proximal convoluted tubulesDistal convoluted tubulesRenal corpusclesNephron loopsComponent of Renal vasculature are:
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The sequence of steps that starts with the sensory receptors in the eye changing light information from the world into electrical signals sent by neurons is an example of _______________
The sequence of steps that starts with the sensory receptors in the eye changing light information from the world into electrical signals sent by neurons is an example of Visual phototransduction.
How does eye perceives light?Eyes are the organs of sight. They provide organism with vision.Light enters the eye through cornea. When light hits the retina (a light-sensitive layer), special cells called photoreceptors turn the light into electrical signals. These electrical signals travel from the retina through the optic nerve to the brain. Then the brain turns the signals into the images you see.Three basic steps by which sensory systems work are Sensation, Transduction and Perception.Sensation is the process by which our sensory receptors and nervous system receive and represent stimulus energies from our environmentTransduction is conversion of one form of energy into another. The transforming of stimulus, such as sights, sounds, and smells, into neural impulses our brain can interpret.Perception is the process of organizing and interpreting sensory information, enabling us to recognize meaningful objects and events.Learn more about eye here:
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The majority of neurotransmitters migrate across the synaptic gap and latch onto receptor sites of the receiving neuron's:
Dendrites of the postsynaptic neurons are the structures that receive chemical messages -neurotransmitters- from the presynaptic neurons. The correct option is D. Dendrites.
What is a synapse?
Neurons are cells that communicate with each other through the transmition of nervous impulses.
Every neuron forms connections with other neurons or with effector organs, such as the muscle. These connections are known as synapses.
Synapses can be either chemical or electrical. The most common one is the chemical synapses that involve the release of a substance known as a neurotransmitter.
During chemical synapses, when a presynaptic neuron sends information, it releases neurotransmitters. This event is done through exocytosis.
The neurotransmitter is a molecule that travels through the synaptic space forward to the dendrites of the other neuron or to the effector cell. Once the chemical reaches the postsynaptic membrane, it binds to its receptors.
This binding neurotransmitter-receptor produces excitatory postsynaptic potential, which is the depolarization of the postsynaptic cell.
Once the action potential is initiated, it spreads to the rest of the membrane, depolarizing it.
According to this framework, when two neurons communicate, the neurotransmitter released by one of them reaches the receptors located in the dendrites of the postsynaptic cell.
Dendrites are the structures that receive chemical messages from the other cells.
The correct option is D. Dendrites.
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The majority of neurotransmitters migrate across the synaptic gap and latch onto receptor sites of the receiving neuron's
A. Myelin sheath
B. Axons
C. Vesicles
D. Dendrites
Which atoms were these molecules made up of and in what relative proportions? which of these atoms plays a central role as the "backbone" to the structure of these atoms? why do you suppose this is?
The key repeating units in these macromolecules are: sugar (aldose/ketose) for carbohydrates, amino acids for proteins, fatty acids and CoA for lipids and a nitrogenous base, sugar and phosphate for nucleic acids.
What is the composition of these macromolecules?Carbohydrates contain only the elements carbon, hydrogen and oxygen (CH2O), and their combustion will yield carbon dioxide plus one or more molecules of water.Proteins contain the elements carbon, hydrogen, and oxygen, and nitrogen. In each amino acid the elements are arranged into a specific conformation around a carbon center.Lipids are composed of carbon, hydrogen and oxygen atoms, and in some cases contain phosphorus, nitrogen, sulfur and other elements.Nucleic acids contain the same elements as proteins: carbon, hydrogen, oxygen, nitrogen and phosphorous (C, H, O, N, and P).Carbon is the key element which serves as the basic structural component, or “backbone,” of the macromolecules.It has unique properties that allow it to form covalent bonds to as many as four different atoms.Carbon is unique in its ability to form large, diverse molecules.Learn more about biomolecules here:
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Disclaimer: The question was given incomplete on the portal. Here is the complete question.
Question: Consider the structure of biologically important macromolecules (i.e. carbohydrates, proteins, lipids, and nucleic acids) and explain the significance of the key elements involved in formation of these molecules. Which atoms were these molecules made up of and in what relative proportions? Which of these atoms plays a central role as the "backbone' to the structure of these atoms? Why do you suppose this is?
Determine what kind of evidence would support the hypothesis that birds evolved from dinosaurs.
Answer:
The first basic evidence is the clear resemblence of ornitosaurian dinosaurs with mordern day birds . Their feet , front limbs and even their skull structure matches with mordern day eagles and falcons . The second evidence is the fossil evidence that shows signs of feathers on theropods from raptors to large theropods like the T-rex .
Explanation:
Fossil Evidence would support the hypothesis that birds evolved from dinosaurs. By the help of fossil evidence from skeletons, eggs and soft tissue.
That evidence of organisms that have existed into the form of fossils.The organism such as tracks or feces or they may part of the organism.The evidence of bacteria , animals, and plants that lived in the past.Evidence used to determine the organism was , when it lived and what major events it experienced during lifetime.
Fossil's have preserved in many different kinds of materials. Many types of fossils evidence are publicly available for viewing at natural science museum.some fossils provide evidence of organisms that no longer exist.
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Most skeletal muscles contain ________
Most skeletal muscles contain connective tissue, blood vessels, and nerves.
What is skeletal muscle?Skeletal muscle can be defined as the type of muscle that is attached to the bones of the skeletal system which helps in body movement.
These skeletal muscles are made up of the following:
connective tissue, connective tissue, blood vessels, and connective tissue, blood vessels, and nerves.Therefore, these contents of the muscle helps in the contraction and relaxation of the muscle fibres.
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Two species of finches found on the same galápagos island but feeding on different food sources is an example of ________ speciation.
Two species of finches found on the same galápagos island but feeding on different food sources is an example of sympatric speciation.
What is speciation?Speciation is the evolutionary process that leads to reproductive isolation and eventually to the emergence of new species.
Sympatric speciation refers to the emergence of reproductive barriers in individuals of the same species that inhabit the same region, whereas allopatric speciation occurs in individuals separated by geographic barriers.
In conclusion, two species of finches found on the same galápagos island but feeding on different food sources is an example of sympatric speciation.
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