Use the example from the PowerPoint and the chart below to answer questions 1-3 about radiometric dating.
1. If you started with a fossil sample that has 2000 grams of potassium 40, how much would be left after 4 half-lives?
After 1st half-life: _______ after a 2nd: _______ after a 3rd:_______ after a 4th:________
2. How many years would you need to wait for those 4 half-lives to occur in problem a?
3. Scientists found a layer of rock with a very old trilobite fossil. They tested the rock layer and found that there was only 12.5% of the original Uranium-235 in it. How old is this trilobite?
Answers
1. If you started with a fossil sample that has 2000 grams of potassium-40:
after 1st half-life: 1000 grams of potassium-40 would be leftafter a 2nd: 500 grams of potassium-40 would be leftafter a 3rd: 250 grams of potassium-40 would be leftafter a 4th: 125 grams of potassium-40 would be left2. You would need to wait for 5.2 billion years for those 4 half-lives to occur in problem a.
3. The age of the trilobite will be 2.13 billion years.
What is the half-life of a sample?The half-life of a sample is the time for half the sample to decay.
Considering the given data:
After, 4 half-live, 1/16 of the mass of potassium will remain.
The mass of potassium-40 remaining = 1/16 * 2000
The mass of potassium-40 remaining = 125 g
The number of years required = 1.3 * 4 billion years
The number of years required = 5.2 billion years
The age of the trilobite will be:
12.5% = 3 half-lives
Age of trilobite = 3 * 710 million years
Age of trilobite = 2.13 billion years.
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Related Questions
The atomic number of Re is 75. The atomic mass of one of its isotopes is 186. How many electrons are in this particular isotope.
Answers
Answer:
75 electrons
Explanation:
Since there is no charge, electrons and protons are the same number. Atomic numbers indicate the amount of protons.
Which organism(s) between w,x,y and z represent a secondary consumer ?
1.x
2.w and y
3. W,y and z
4.z
Answers
True/False: Chromosomes contain genes that are
made of DNA and the order of nitrogen bases control
how the traits will be expressed (show up).
True
False
Answers
Answer:
True
Explanation:
Chromosomes do contain genes, and genes are in the cell nucleus. :)
5.Muscle that is attached to bones for movement and helps protect your inner organs is ____________________________.
smooth muscle
cardiac muscle
skeletal muscle
Answers
Answer:
cardiac muscle
I'm pretty sure that's the correct answer
A receptor is a set of modified dendrites of the:
a. nerve.
b. interneuron.
c. motor neuron.
d. sensory neuron.
Answers
3. Explain the role of organisms in the carbon
cycle and oxygen cycle
Answers
What organism? If its plants, they give oxygen during the day and carbon dioxide in the night. While animals give carbon dioxide but take oxygen from the air. These carbon dioxide gas and oxygen gas go to the atmosphere and affect the carbon cycle and oxygen cycle.
Here is the cycle if you want to know more
Plants (give out oxygen) -> Animals (Use oxygen) + (given our carbon dioxide) -> plants (take oxygen)
and so on
Answer:
Plants take carbon from the atmosphere in the form of carbon dioxide during photosynthesis. Plants and animals both release carbon dioxide back into the atmosphere through the process of respiration. When organisms die, some of the carbon in their bodies is stored in the soil, which can be reintroduced into the atmosphere through soil respiration.
Explanation:
sample response
Where are most mountains on earth formed
At volcanic chains
At strike slip faults
At mid ocean ridges
At convergent plate boundaries
Answers
What are the biological implications of the structure of the plasma membrane (how do your results about the fluid mosaic and findings relate to life and death in the ‘real’ world? Where could the materials you worked with be found affecting the real world?)
Answers
Answer:
Structure of Plasma Membranes
The primary function of the plasma membrane is to protect the cell from its surroundings. Composed of a phospholipid bilayer with embedded proteins, the plasma membrane is selectively permeable to ions and organic molecules and regulates the movement of substances in and out of cells.
Explanation:
You only have to answer the first question. I will give brainliest to the best answer.
Answers
Answer:
The mushroom is composed of two parts, the above ground part, and the underground part. Each part has its unique function and purpose in the life cycle of a mushroom.
Spores
It is usually released into the air and falls on the ground to start the life cycle of the mushroom. Seeds that acts as the mushrooms reproductive system.
Stem
A soft branch is supporting the mushroom’s cap.
Gill
Located under the cap, it produces the spore of the mushroom.
Mycelium
This part of the mushroom serves as the breeding ground of smaller mushrooms to grow.
Hypha
The microscopic filament that draws water and the organic matter necessary for mushroom development.
Volva
The remnant of a membrane that completely covers the immature mushroom.
Ring
A covering located under the cap surrounding the stem.
Cap
The upper part of the mushroom that protects the gills. It usually resembles a headdress, hence its name.
Hope it helps!!!
What is the universe made of
Answers
Answer:
composition
Explanation:
the universe is composed almost completely of dark energy, dark matter , and ordinary matter
Answer: matter , atoms
Explanation:
5. All cells
a. Are enclosed in a membrane that maintains internal conditions different from the surroundings
b. Have DNA as genetic material
c. Require energy to function
d. All of the above are correct
Answers
1. A group of individuals of the same species that mate and produce offspring is called a
A. gene pool.
B. niche.
C. genetic family.
D. population.
2. Any change in the genetic material of a cell is called a
A. mutation.
B. single-gene trait.
C. genotype.
D. polygenic trait.
3.In genetic terms, evolution is defined as any change in the relative frequency of
A. a single-trait gene of a population over time.
B. alleles in the gene pool of a population over time.
C. genes in a population over time.
D. phenotypes of a population over time.
Answers
2:a
3:a
Looked them up but you know the internet and what you have been taught could be different so good luck
1.
Young hermit crabs pick up sea anemones which live on their shells. The stingy tentacles of the anemone keep fish from eating the hermit crab, and the sea anemone is able to eat leftover food from the hermit
crab. Which best describes the relationship between the sea anemone and the hermit crab?
A commensalism
B. O mutualism
c. parasitism
DO predation
Answers
Answer:
mutualism.
Explanation:
Mutualism can be defined as an symbiotic relationship or interaction between two or more living organisms of different species that typically involves each organism benefiting positively. Therefore, mutualism influences the survival and reproduction of living organisms in their habitats.
In this scenario, young hermit crabs pick up sea anemones which live on their shells. The stingy tentacles of the anemone keep fish from eating the hermit crab, and the sea anemone is able to eat leftover food from the hermit crab. Therefore, the relationship between the sea anemone and the hermit crab is best described as mutualism because both of them are benefiting from the interaction.
Simply stated, the sea anemone provides protection (security) from predators for the hermit crab while the hermit crab provides food for the sea anemone.
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Answers
Answer:
any problem with anthing??
they go upwards when photosynthesis doesn’t occur (winter) to provide nutrients and cellular energy to parts like the leaves
How do the distances between the terrestrial plants compare to the distances between the gas giants?
Answers
Answer:
They are different from rocky or terrestrial planets that are made of mostly rock. Unlike rocky planets, gas giants do not have a well-defined surface – there is no clear boundary between where the atmosphere ends and the surface starts! The gas giants have atmospheres that are mostly hydrogen and helium.
Explanation:
I hope this helps!
They vary from planets that are predominantly made of rock, such as rocky or terrestrial planets. Unlike solid planets, gas giants lack a clearly defined surface, there is no discernible line separating the atmosphere from the surface.
What are terrestrial planets?Telluric planets are another name for terrestrial planets. The Latin words terra and tellus, which both indicate Earth, are the source of the words terrestrial and telluric, respectively.
While the terrestrial planets were warmed by the sun's rays, the Jovian planets developed above the frost line.
Worlds that could float on water and worlds appropriate for manned missions were created under very distinct circumstances, but they have some striking similarities. Every world in our solar system is different.
Therefore, the atmospheres of the gas giants are primarily composed of hydrogen and helium.
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Which distinguishes mitosis from meiosis?
A. Mitosis has one DNA replication, while meiosis has two DNA replications.
B. In mitosis, the nucleus divides once. In meiosis, the nucleus divides twice.
C. In mitosis, homologous chromosomes pair up. In meiosis, there is no pairing of chromosomes.
D. Mitosis results in the production of gametes, while meiosis results in the production of body cells.
Answers
Answer:
Your answer would be B.
Explanation:
In mitosis, the nucleus divides once. In meiosis, the nucleus divides twice.
Answer:
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What is Carbon Dioxide?
A medicine
B candy
C colorless gas
D special kind of steel
Answers
Answer:
Colorless gas
Explanation:
Is the Great Green Wall an example of Secondary Succession?
Answers
Answer:
The Great Green Wall is taking root in Africa's Sahel region, at the southern edge of the Sahara desert. The Great Green Wall is a symbol of hope in the face of one of the biggest challenges of our time - desertification. This game changing African-led initiative aims to restore Africa's degraded landscapes and transform millions of lives in one of the world's poorest regions, the Sahel.
Primary succession occurs on land where no previous growth has taken place and there is no substrate/soil. Secondary succession occurs on land where there has been previous growth, the soil and seed bank makes up the substrate.
Explanation:
I majored in Biology
PLEASE I NEED HELP ILL GIVE BRAINIEST !!!!
Answers
Answer:
the correct sequence of arrangement of level of ecological organization from least to most inclusive is organism,population, community
Answer:
Its below in the explanation
Explanation:
Domain, Kingdom, Phylum, Class, Order, Family, Genus, Species.
Since species is the widest category.
Scientists compare the structures of a chicken embryo and a human embryo at the same stage of development. They find that both vertebrates have
similar shapes and structures, including the presence of gill slits and tails. How is this comparison of the embryos used as supporting evidence of
evolution?
The similarities suggest that chickens and humans are the direct descendants of modern-day fish with tails and gill slits.
The similarities suggest that vertebrates pass through each of the adult stages of their evolutionary history as they develop.
o
The similarities suggest that vertebrates can undergo genetic changes during development that lead to the evolution of new species.
Answers
Answer:ABCD
Explanation:
Answer:
is C correct?
Explanation:
Which of the following diagrams shows a pure substance that is composed of only individual atoms and not molecules?
Answers
Answer:Argon Gas maybe?
Explanation:Just got it right lol
1 point
Which explanation best identifies the relationship between mitosis and
reproduction? *
Mitosis is a form of sexual reproduction because the daughter cells form from one
single parent cell.
Mitosis is a form of sexual reproduction because the daughter cells are genetically
different from the parent cell.
Mitosis is a form of asexual reproduction because the daughter cells form a new
nuclear membrane after reproduction
Mitosis is a form of a sexual reproduction because the daughter cells are genetically
identical to the parent cell.
Answers
Answer:
Mitosis is a form of sexual reproduction because the daughter cells are genetically identical to the parent cell.
Explanation:
If you look up your question, it will give this exact answer.
Two plants were being tested for growth. Both were given water and proper soil, etc. However, one was placed in the closet, and one was placed in the window sill. Why did the one in the closet die?
Question 4 options:
It did not have chloroplasts.
It was not around other plants.
It did not receive sunlight.
It was not around people enough.
Answers
Answer:
It did not receive sunlight.
Explanation:
Plants need sunlight to survive along with water and nutrients from the soil.
Sound waves travel better through solid than through a gas. Explain why this is true.
Answers
Answer:
solids are more tightly packed together (the molecules) than liquid or gas so it allows it to travel through vetter/faster
Answer:
Explanation: Solids are packed together tighter than liquids and gases, hence sound travels fastest in solids. The distances in liquids are shorter than in gases, but longer than in solids. Gases are the slowest because they are the least dense: the molecules in gases are very far apart, compared with solids and liquids
Which statement best explains why the classification
schemes of taxonomists have changed over time?
A. New technology like DNA sequencing allows scientist to have a more accurate genetic evolutionary history
B. New information about the genetics of species is being discovered.
C. Molecular biology has provided more detailed evidence for the relationships
between organisms.
D. All of the above
Answers
Answer:
D.
Explanation:
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Classification of organisms is defined as dividing living beings into different kingdoms based on their genetics, traits, and other features.
Why did Classification Schemes of taxonomists change?Taxonomists arrange and divide the organisms based on the DNA, traits, and features of the living organisms. The advancements in technology led the taxonomists to have more information on genetic lineage and arrange them accordingly. Introduction and discoveries of new species, their genetic make-up, and traits also contribute to the change of classification system. Molecular biology, cellular level studies, and genetics of species have contributed to the classification of organisms.
Thus, the given statements about the classification of organisms are correct.
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Put "Single Trait Genes" in a sentence
Answers
Answer:
Mendelian inheritance refers to the inheritance of traits controlled by a single gene with two alleles, one of which may be dominant to the other. Explanation:
Hope this helps
Answer:
Basically inheritance of traits controlled by a single gene with two alleles, one of which may be dominant to the other
Explanation:
Single Genes Autosomal Traits are a example.
PLS HELP ASAP!!!!!!!
Answers
Answer:
3. A and B are true
4. oxygen, photosynthesis, I think oxygen, cellular respiration
Explanation:
Hope this helps! :) I am think all of my answers are correct.
The number of atoms gained lost or shared by an atom in a chemical bond is also known as
A it's charge
B it's atomic number
C it's valency
D its mass number
Answers
Explanation could be right
True or False
An increase in cell size results in an increase in surface area to volume ratio.
Answers
Answer:
true I think
Explanation:
I think so I hope so
Go find 5 materials that's u can use in ur garden.
Please answer.
Answers
Answer:
Soil knife to make digging the soil easierHandheld pruners to fix and prune the plants of your gardenGloves to keep your hands save from any harmful or chemical substance.Binder twine to maintain the plants (to tie their stems together)A notepad and pen to check the progress of your plants (e.g.: you might need to note down whether a plant may need more water or nutrients (mineral ions), if you see a plant almost wilting, appropriate actions must be taken so notepad and pen can help you track this down, so that you can get the appropriate resources needed)(Done with the help of goxogle, but summarized, check full website here: https://gbbg.org/2020/03/5-tools-garden-bag/ )