A helium atom that has only two electrons will have its electrons in which orbital(s)?
1s orbital
Explanation:
The electron has to go into the first energy level, in the 1s orbital. Helium, with two protons, will have two electrons. These are placed one at a time into the 1s orbital. This makes helium a very contented atom.
In the first step of pollination, _____ from the male anther is transferred to the female _____. The pollen grain is then carried down the _____ to the ovary. Inside it meets with an ______. This is the process of fertilization.
WILL GIVE BRAINLIEST IF YOU HELP, IT'S DUE TMRWWW
Answer:
1. pollen grains
2. stigma
3. style
4. egg cell of an ovule
According to the Base Pair rule, Cytosine always pairs with
Answer:
Guanine always pairs with Cytosine. :)
Biologically important tautomers involve Biologically important tautomers involve blankfor thymine and guanine and blank for cytosine and adenine.
a. True
b. False
Answer:
The correct answer is B.
Explanation:
Adenine and guanine are purine bases, thymine and cytosine are pyrimidines which make up the structure of the DNA. They are not tautomers. They can however get involved in tautomerism which is the transfer of protons and electrons between chemical compounds that are usually structurally isomers. So the answer is B.
I hope this helps.
Hydrogen bonding is primarily responsible for the high ______ of water.
a. freezing point
b. boiling point
c. conductivity
d. polarity
The hydrogen bond is responsible for many of the anomalous physical and chemical properties of compounds of N, O, and F. In particular, intermolecular hydrogen bonding is responsible for the high boiling point of water (100 °C) compared to the other group 16 hydrides that have much weakerhydrogen bonds
Explanation:
Therefore, option b is correct.Hydrogen bonding is primarily responsible for the high boiling point of the water. Thus, the correct option is B.
What is Hydrogen bonding?Hydrogen bonding is an interaction which involves a hydrogen atom that is located between a pair of other atoms such as nitrogen, oxygen, and fluorine which have a high affinity for electrons, and such a bond is weaker than an ionic bond or a covalent bond but are stronger than van der Waals forces and dispersion forces.
Hydrogen bonding is primarily responsible for the high boiling point of water solvent. Hydrogen bonding is a strong affinity. Hydrogen bonding is created when a hydrogen atom is bonded to an electronegative atom by approaching a nearby electronegative atom.
Therefore, the correct option is B.
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A population of rabbits lives in a grassy field that is lush and green in summer and covered in snow in winter. At the start of the summer, 75% of the population are white rabbits, and the remaining 25% of the population are brown rabbits. In rabbits, white (W) is dominant over brown (w). During the summer, the field where they live experiences a drought. The summer drought lasts for two years, through many generations of rabbits.
Which prediction BEST estimates the expected percent of white and brown rabbits in the population at the end of the drought?
Answer:
The rabbit population will consist of 35% white rabbits and 65% brown rabbits.
Explanation:
hope this helps!
The rabbit population will consist of 35% white rabbits and 65% brown rabbits.
What are the limiting factors of the rabbit population?Until a limiting factor, such as low reproduction, food scarcity, predation, disease, and/or weather conditions restrict populations, the population tends to grow.
Some density-dependent limiting factors are the spread of pathogens, competition for nesting locations, the destruction of habitat, increase in the population of predators. Several predators, including raptors and coyotes, use rabbits as food, but in urban and suburban areas, cats and dogs pose the biggest threat. Some abiotic limiting factors are drought, flood, earthquake, and all types of natural disasters.
Thus, the rabbit population will consist of 35% white rabbits and 65% brown rabbits.
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In 4-5 sentences, explain why it is important for our cells to undergo the cell cycle.
Answer:
If our cells don't undergo the cell cycle, our body will run out of cells and we'll maybe suffer from diseases and the cells in our body isn't able to fight the disease and we might die. Our body is made up of good cells which protects our health.
What structure has become useless through evolution but still exists,
typically in a much reduced form?
Answer:
A "vestigial structure" or "vestigial organ" is an anatomical feature or behavior that no longer seems to have a purpose in the current form of an organism of the given species. Often, these vestigial structures were organs that performed some important functions in the organism at one point in the past.
Explanation:
Through what process can scientists artificially change the DNA code of organisms?
A)DNA fingerprinting
B)Polymerase Chain Reaction
C)Cloning
D)Recombinant DNA
Answer:
cloning is the right answer
Through Recombinant DNA scientists can artificially change the DNA code of organisms.
What is recombinant DNA?Recombinant DNA is a term used to describe the process of creating new combinations of DNA from different sources. This is done by cutting DNA molecules from different sources and joining them together, creating a recombinant molecule.
This process is often used in biotechnology for applications such as creating new vaccines, improving crop yields, and producing therapeutic proteins. Recombinant DNA technology plays a crucial role in many areas of modern biology and medicine, including genetic engineering, gene therapy, and drug discovery.
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Which action is necessary for a solar eclipse to occur?
The Moon needs to be full.
Earth needs to pass in front of the Sun.
The Sun needs to pass in front of the Moon.
The Moon needs to pass between Earth and the Sun.
How does the gametophyte generation differ genetically from the sporophyte generation?
It contains a full set of genetic material (is diploid).
It undergoes asexual reproduction.
It lacks genetic material (DNA).
It contains half the genetic material (is haploid).
Answer:
I'm pretty sure it is d.
Explanation:
Answer:
It contains half the genetic material (is haploid).
Explanation:
right on edge
A decomposer is an organism that gets its energy from ____________.
Group of answer choices
the food it produces during photosynthesis
the prey it hunts and kills
from other living organisms
dead plant and animals
Explain how a male / female contraceptive pill works
Answer:
When the sperm enters the female, the chemicals from the pill kill the sperm. Therefore the female won’t get pregnant.
Explanation:
right above me.
2. Which type of nuclear energy is used in commercial nuclear reactors to produce electrical
energy? In two to three sentences, describe how a nuclear power plant works.
Answer:
nuclear fission
Nuclear power comes from nuclear fission
The steam is used to spin large turbines that generate electricity. Nuclear power plants use heat produced during nuclear fission to heat water. In nuclear fission, atoms are split apart to form smaller atoms, releasing energy
In nuclear power plants, neutrons collide with uranium atoms, splitting them. In the core of nuclear reactors, the fission of uranium atoms releases energy that heats water to about 520 degrees Farenheit. This hot water is then used to spin turbines that are connected to generators, producing electricity
Explanation:
Explain how to revise the following DNA model to form mRNA
AACCTGGGACTATGAT
List and explain the characteristics of living things
Answer:
Life process
Movement
Respiration
Sensitivity
Growth
Reproduction
reason:
Life process
Explanation
Earthworms
Movement
All living things move in some way. This may be obvious, such as animals that are able to walk, or less obvious, such as plants that have parts that move to track the movement of the sun.
Earthworms use circular and longitudinal muscles to move through soil or along surfaces.
Respiration
Respiration is a chemical reaction that happens within cells to release energy from food.
The food that earthworms eat supplies their body with energy-rich molecules such as glucose. On entering the cells of their body, these molecules are broken down in a series of steps to release energy to be used by the body, producing carbon dioxide and water as waste products.
Sensitivity
The ability to detect changes in the surrounding environment.
Earthworms have light-sensitive cells scattered in their outer skin. Their skin cells are also sensitive to touch and chemicals.
Growth
All living things grow.
Earthworms hatch from eggs and can grow up to a metre or more in length! Some earthworms are also able to regrow small parts of their body that have been lost or injured.
Reproduction
The ability to reproduce and pass genetic information onto their offspring.
Earthworms have both sperm and eggs within their bodies (they are hermaphrodites) but they cannot self-fertilise and need to mate with another individual. After mating, a cocoon containing the fertilised eggs is deposited in the soil.
Excretion
Getting rid of waste.
Earthworms excrete waste from their anus – the last segment of their body.
Nutrition
The intake and use of nutrients. This occurs in very different ways in different kinds of living things.
Earthworm nutrition comes from a variety of sources, depending on their species. Food types include manure, compost, plant material, fungi, microorganisms and decaying animals. They take in food through their mouths.
Cape Town, South Africa has a significant water shortage. The amount of water available is not sufficient to support the current human population of the city.
Which three factors most likely contributed to the growing water shortage?
- Strict water management policies.
- Naturally-occurring drought conditions.
- Underdeveloped alternative and supplemental water sources.
- Migrations of residents out of the city and into surrounding areas.
- Higher demand for water than natural reservoirs accumulate each year.
Explanation:
The city's water supply shortage seems to be the result of a combination of physical, social, and political factors. Well below-average rainfall patterns, the increasing unpredictability of weather conditions due to anthropogenic climate change impacts, population growth, and government mismanagement have produced one of the worst urban water crises in recent memory.
here is the reason your explanation from the water shortage now just figure out what the factors are in your answers I would say it's naturally occurring drought conditions because it says on here well below average rainfall patterns and climate change
Water shortage can occur as a result of mismanagement practices by humans or as a result of natural occurrences such as droughts.
What is water shortage?Water shortage refers to a situation in which there is not enough water to meet the daily water needs of the human, animal and plant population in a particular area.
The water shortage issue in Cape Town, South Africa could have been as a result of:
Naturally-occurring drought conditionsUnderdeveloped alternative and supplemental water sourcesHigher demand for water than natural reservoirs accumulate each yearTherefore, water shortage can occur as a result of mismanagement practices by humans or as a result of natural occurrences such as droughts.
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The top layer of the soil in the diagram is composed MAINLY of
A)
sand and clay.
B)
solid bedrock
C)
many types of minerals.
D)
decaying organic material.
Answer:
?
(there is no diagram)
In peas, round shape is dominant (R) over wrinkled (r) and yellow color is dominant (Y) over green (y). If both parent plants are heterozygous for both traits,
what is the probability of an offspring's phenotype being round and yellow?
HELP I NEED A NUMBER OUT OF 16
Answer:
9/16
Explanation:
RrYy x 2
Answer:
9 out of 16 (also 9/16)
Explanation:
Count the likeliness of the offspring to be round:
RR, Rr, rR, rr
round shape is 3 out of 4 times
Count the likeliness of the offspring to be yellow:
YY, Yy, yY, yy
yellow color is 3 out of 4 times
Multiply the likeliness of being round and being yellow (since they are two independent probabilities, we are using multiplication rule):
3/4 * 3/4 = 9/16
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What is defined as the variable in a controlled experiment that is purposely changed or manipulated? PLEASE HELP!!
constant
independent variable
controlled variable
dependent variable
Answer:
Independent Variable
Explanation:
________ cells lack a membrane-enclosed nucleus.
Answer:
Prykaryotic
Explanation:
Prykaryotic cells lack a membrane-enclosed nucleus.
How do mosses and ferns reproduce?
with spores
with seeds
with eggs
with sperm
I think the answer is -> SPORES <-
Genes for body color (B black dominant to b yellow) and wing shape (C straight dominant to c curved) are located on the same chromosome in flies. If single mutants for each of these traits are crossed (i.e. a yellow fly crossed to a curved-wing fly), and their progeny is testcrossed, the following phenotypic ratios are observed among their progeny.
Black, straight 17
yellow, curved 12
black, curved 337
yellow, straight 364
Required:
Calculate the map distance between B and C.
Answer:
Map distance = Genetic distance, GD = 3.9 MU ≅ 4 MU
Explanation:
The more separated two genes are, the more chances of recombination there will be. The closer they are, the fewer chances of recombination there will be. Two genes that are very close will have a few recombination events and are strongly bounded.
To analyze the recombination frequency, we have to know that:
1% of recombination = 1 map unit = 1centi Morgan = 1,000,000 base pairs. And that the maximum recombination frequency is always 50%.The map unit is the distance between the pair of genes for which every 100 meiotic products one of them results in a recombinant one.
Knowing that the genes are linked, we can calculate genetic distances between them. First, we need to identify the genotypes of the parental gametes with the ones of the recombinants. We can recognize the parental gametes in the descendants because their phenotypes are the most frequent, while the recombinants are the less frequent. So:
Parentals:
black, curved 337yellow, straight 364Recombinants:
Black, straight 17yellow, curved 12To calculate the recombination frequency we will make use of the next formula: P = Recombinant number / Total of individuals.
P = Recombinant number / Total of individuals.
P = 17 + 12 / 337 + 364 + 17 + 12
P = 29 / 730
P = 0.039
The genetic distance (GD) will result from multiplying that recombination frequency (P) by 100 and expressing it in map units (MU).
GD = P x 100
GD = 0.039 x 100
GD = 3.9 MU ≅ 4 MU
What’s one indirect consequences of building Seawalls
Answer:
The shoreline Habitat is destroyed through loss of sand.
Explanation:
Some organisms reproduce sexually. Other organisms reproduce asexually. What are some benefits of asexual reproduction?
1.It It benefits organisms that are immobile
2.immobile.It gives offspring the genetic traits to survive in a particular environment
3. It uses less energy.
4. energy.All of of the above above
Answer:
3
Explanation:
because you don't have to ...you know
Answer:
It is 4 all of the above.
Explanation:
Yes because I got it right on test.
Given the sequence of DNA nucleotide bases TTAGCCTTG, give the complementary strand of RNA.
Answer:
AAUCGGAAC
Explanation:
Notice how it says RNA, which means T is replaced with U
Complementary sequences are A and U, and G and C
Need Help ASAP plz will give Brianliest. Digestive juices contain enzymes, water and some
other substances. Name two of these other substances.
State which digestive juice contains them, and state
what function they perform.
Answer:
Hydrochloric acid Prepares protein for digestion (denaturation) Activates enzymes and “Disinfection”
Pepsin (an enzyme) Begins protein digestion
Gastric lipase Some lipid digestion
Gastrin (hormone) Stimulates gastric secretion and movement
Intrinsic factor (a glycoprotein) Needed for absorption of vitamin B12
Explanation:
An object in motion tends to stay in motion and an object at rest tends to
stay at rest unless an outside force act on it is called
Kinetic energy
Potential energy
Newton's First Law
Acceleration
Answer:
Newton's first law
Explanation:
The focus of Lesson 1 is Newton's first law of motion - sometimes referred to as the law of inertia. An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.
Despite the rampant depletion of trees in the natural forest in Ghana,it is still worth using wood as the main construction.Disscuss
Answer:
Hope this helps!
Explanation:
Forest resources support livelihood of people in jurisdictions in which forest is located. However, the forest size is gradually depleting continuously. The lack of information about the specific agents and forces of forest depletion is worrying. This is due to the inter-generational and intra-generational equity notions that affect mankind. As such, there is the need to maintain such resources on a non-declining value basis so as to maintain human welfare over time. Thus, the objective of this study is to empirically examine the determinants of forest depletion in Ghana over the 1970-2012 period in Ghana. This study employs multiple regression concepts to examine the effects of the determinants on forest depletion. The findings of the study indicate that gold extraction for export, population growth and logging increase the rate of forest depletion for the study period. More significantly, population growth reflected in settlement expansion, agriculture purposes, increased use of fuel wood, etc have greater effect on forest loss in Ghana. This suggests that, protection of the forest is necessary and sufficient condition for economic growth. As a result of these, both government and policy-makers need to safeguard the forest estate, by increasing afforestation schemes and also using part of the returns from gold exports to regenerate the forest.
Answer:
The main cause of deforestation is agriculture (poorly planned infrastructure is ... In 2019, the tropics lost close to 30 soccer fields' worth of trees every single minute. ... of Texas could be lost to rampant deforestation, according to a WWF report. ... These fires not only alter the structure and composition of forests,
Explanation:
Which of the following increases the population size?
a. favorable light and temperatures
b. inadequate food supply
c. inability to complete
d. inability to migrate, hide or defend
e. inability to resist disease
Favorable light and temperatures can increase population size
Inadequate food supplies can lead to starvation and/or death
If a population can’t migrate, hide or defend, they will likely die
Populations need to be able to resist disease or they will be wiped out