When a scientist is using potassium-40, a radioactive isotope of potassium, to find the absolute age of a fossil by radioactive dating, what additional is necessary for the scientist to determine the absolute age of the fossil Potassium-40 has a half-life of approximately 1.25 billion years, which makes it a common isotope used in radioactive dating.
This technique is used to determine the age of organic substances, including fossils. The following are the steps involved in determining the absolute age of a fossil by radioactive dating:Calculate the percentage of remaining radioactive isotopes. In this case, the scientist determined that about three-fourths of the original potassium-40 atoms in the fossil now remain in the fossil.
The next move is to determine the percentage of parent and daughter isotopes present. Scientists can use a variety of techniques to extract the parent and daughter isotopes from a sample. In this case, potassium-40 decayed into argon-40, which remained in the fossil. To calculate the percentage of parent and daughter isotopes, the ratio of parent isotope to daughter isotope is measured.
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Which is an example of osmosis?
A. Water moving into the root cells of a plant
B. Oxygen moving into the bloodstream from
the lungs
C. Potassium ions moving in and out of an
animal cell
D. All of the above
are polymers always neutral?
Answer:
The eight most common types of synthetic organic polymers, which are commonly found in households are:
Low-density polyethylene (LDPE)
High-density polyethylene (HDPE)
Polypropylene (PP)
Polyvinyl chloride (PVC)
Polystyrene (PS)
Nylon, nylon 6, nylon 6,6.
Teflon (Polytetrafluoroethylene)
Thermoplastic polyurethanes (TPU
why is it essential to life that water has a high heat capacity?
Answer:
A high specific heat of a substance means that a large amount of heat is required to raise the temperature of the substance. ... Water covers around 70% of the Earth's surface and its high specific heat plays a very important role as it is able to absorb a lot of heat without a significant rise in the temperature.
Explanation:
Which change to one of the kits would make it useful for modeling proteins?
A. Set 1, add a box for phosphorous (P) atoms.
B. Set 2, add a box for sulfur (S) atoms
C. Set 3, replace the box of phosphorous (P) atoms with a box of sulfur (S) atoms
D. Set 4, replace the box of oxygen (O) atoms with a box of nitrogen atoms (N)
Answer:
it C
Explanation:
i took a test like these
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Factors that influence climate include latitude, prevailing winds, ocean currents, elevation, surface type, and landforms.
Provide an example of how two or more climate factors are related.
Please please answer this! I have it due today, and I really struggle with science!
Answer:
Two climate factors that are related are Elevation and Ocean Currents.
Explanation:
Ocean Currents depend on the altitude of Elevation. If the Elevation of land is below sea level it will have higher and more ocean currents, on the other hand, If the Elevation of the ground is higher than sea level it will see a decrease or almost nothing of Ocean Currents.
Hope it Helps! :D
Trisha wants to find out whether a certain pesticide is carcinogenic to amphibians. Trisha is designing an experiment to test the problem. She is planning on exposing frogs of the same species to different amounts of the pesticide. Should Trisha include a control group in her experiment? A. No, Trisha will not need a control group because if any frogs develop cancer, it will be obvious that the pesticide is the cause. B. No, a control group is not necessary because Trisha will be testing different exposure rates of the pesticide. C. Yes, Trisha should have a group of frogs in her experiment that are not exposed to any pesticide at all. D. Yes, Trisha should use a different species of frogs as her control group.
Answer:
C. Yes, Trisha should have a group of frogs in her experiment that is not exposed to any pesticide at all
Explanation:
The election of a control group is essential in an experiment. Its principal purpose is to allow the discrimination of the results obtained by the treatment in the study (in this case, the effect of pesticide) from the results that might be a consequence of other factors. The control group must be selected from the same population of the treatment group. All the groups must be similar in every variable that might influence the results, except for the study treatment.
Control group: Frogs that are not exposed to any pesticideTreatment one: Frogs exposed to a certain concentration of pesticideTreatment two: Frogs exposed to an increased concentration of pesticides ...And so, the number of treatment groups will depend on the different concentrations of pesticides Trisha wants to study.
All groups must belong to the same population and of course, to the same species. They must also be exposed to the same variables, excepting for the pesticide variable.
What do you think would happen to a jellyfish if it were placed in a freshwater lake?
A jellyfish would die if it was placed in a freshwater lake. Water would enter the jellyfish's cells, causing them to swell and eventually burst.
hope this help. :)
[ It's basically the same answer that someone else put, just with a little bit more information. ]
A jellyfish would die if it was placed in a freshwater lake. Salt water has more solutes than freshwater, so a freshwater environment would be hypotonic to a jellyfish's cells. Water would enter the jellyfish's cells, causing them to swell and eventually burst.
[ Sounds like a pretty painful way to die, huh? ]
[ And yes, I realize this is from 2020, I just had to. ]
Which star will most likely have heavier elements such as iron, silicon, oxygen, neon, and carbon in its core?
Question 5 options:
White dwarf
Protostar
Main sequence
Supergiant
Answer:
Supergiant
Explanation:
supergiants is one of the massive and most luminous star that has a visual magnitudes between about −3 and −8, the temperature range from about 3,400 K to over 20,000 K. its element are different from less luminous stars. It shows helium and nitrogen at the surface due to convection of these fusion products to the surface, helium is also formed in the core and shell by fusing hydrogen and nitrogen. They contain carbon-13, lithium and s-process elements and also enriched with oxygen.
is hydrogen sulfide an organic molecule
Answer:
no
Explanation:
Answer:
No
Explanation:
Organic compounds are those that contain carbon-hydrogen bonds, i.e. we can say that all organic compounds are made up of carbon and hydrogen, as well as other elements if the molecule contains them. In H2S , it is hydrogen sulfide, and no carbon is present, and so it cannot be an organic compound.
Which is the best explanation of how catalysts are used in chemical reactions A. Catalysts are needed for every chemical reaction to get started B. Each catalysts can only be used once for a given chemical reaction C. Catalysts lower the activation energy for chemical reactions to start D. Each catalysts can bind with a few different substrates to get chemical reaction stated faster
Answer:
A catalyst is a substance that can be added to a reaction to increase the reaction rate without getting consumed in the process. Catalysts typically speed up a reaction by reducing the activation energy or changing the reaction mechanism. Enzymes are proteins that act as catalysts in biochemical reactions
Explanation: I don't know if this will help but hopefully it does
Contrust a food chain to illustrate the flow of energy between the organism used in this simulation.
Answer:
Producers, or autotrophs, make their own organic molecules. Consumers, or heterotrophs, get organic molecules by eating other organisms.
A food chain is a linear sequence of organisms through which nutrients and energy pass as one organism eats another.
In a food chain, each organism occupies a different trophic level, defined by how many energy transfers separate it from the basic input of the chain.
Food webs consist of many interconnected food chains and are more realistic representation of consumption relationships in ecosystems.
Energy transfer between trophic levels is inefficient (with a typical efficiency around 10\%10%10, percent). This inefficiency limits the length of food chains.
Explanation:
:
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QUESTION 1: How has the rise in human settlement in California contributed to
habitat changes in small and large-scale ecosystems?
Your answer
Answer:
it helps in the human envirment that it has now changed, and contributed in many breeds, and health of the animals that the human)people had helped with
Please help I'm stuck
Answer:
its a plant cell
Explanation:
Once you notice that someone seems to be considering to jump off a building, what is the next step you should take?
A. leave them alone
B. care enough to ask them about it
C. tell a friend about your concerns
Answer:
care enough to ask them about it
Explanation:
NEED HELP ASAP PLS DUE IN 23 min
During translation, what does the tRNA deliver to the ribosomes?
Answer: amino acids
Explanation:
In the human body, the brain regulates and controls all of the functions of the body. Which organelle in a cell has a similar function? Ribosome Mitochondria Nucleus Vaculoe
Answer:
nucleus
Explanation:
the nucleus is the kind of the Center of the cell with the DNA string which is important for creating protein and therefore regulating processes intra and extra cellular
What is a sediment? How are they classified?
Answer: matter that settles to the bottom of a liquid dregs.
Sedimentary rocks are classified based on how they form and on the size of the sediments, if they are clastic.
Explanation:
This is truth or false questions
Write true if the statement is true or false if the statement is false.
_____ 1. Science is a set of knowledge and also a way of knowing things.
_____ 2. A scientific hypothesis is useful only if it is proven to be true.
_____ 3. Controls are factors that could affect the outcome of an experiment.
_____ 4. A scientific investigation always begins with a theory.
_____ 5. An example of a scientific hypothesis is that angels dance on the head of a pin.
_____ 6. An example of a scientific theory is the theory of plate tectonics.
_____ 7. A globe is a physical model of planet Earth.
_____ 8. Only models that are perfect representations of reality are useful in science.
_____ 9. You should wear a hoodie to protect your hair when you work in a science lab.
_____ 10. You should take a first aid kit when you do a science investigation in the field.
Explanation:
1.true 2.true 3.false 4.false 5.true 6.true 7.true 8.true 9.true 10.false
Why do testicle need to keep cool at an certain, degrees?
The remains of living plants or animals are called fossils.
True
False
Answer:
I think it's True (viewpoint)
Answer:
true
Explanation:
inetertia is the tendency of an object to resist motion?
Answer: Yes
Explanation: Inertia: tendency of an object to resist changes in its velocity
During strenuous exercise, the heart rate of an individual normally increases. Which factor is being regulated by this increase in heart rate?
A.water
B.oxygen
C.ammonia
D.temperature
Answer:
Increased heart rate, during strenuous exercise, helps to regulate the oxygen reaching the tissues.
Explanation:
Physical exercise implies an increased effort of the muscles, increasing the energetic demand and the substrate to produce more energy.
Both glucose and oxygen are needed by the muscle tissue during physical exercise, so the increased heart rate ensures the supply of oxygen to that tissue.
Therefore, an increase in heart rate contributes to the regulation of oxygen, whose requirements by the muscles increase with exercise.
Other options are not correct because:
A and C. Water and ammonia regulation is done at the renal level.
D. Regulation of temperature depends on the thermoregulatory center of the nervous system.
In paragraph 1, we learn about angiosperms and gymnosperms. Which of the following statements is true?
1. Angiosperms appear in the fossil record about 160 million years ago.
2. Gymnosperms were originally the dominant, tall plant in the fossil record.
3. Conifers are pollinated by wind and chance.
4. All of the above
The statement that is true about angiosperms and gymnosperms are Conifers are pollinated by wind and chance.
What is true about angiosperms and gymnosperms?Angiosperms, also called flowering plants, have seeds that are retained within an ovary , whereas gymnosperms have no flowers , and have “very small” seeds on the surface leaves.
Thus, option "C" is correct, Conifers are pollinated by wind and chance.
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Desert plants become dormant or stop growing temporarily during the ________ season.
Answer:
During dry periods they do not perform many water-draining functions such as photosynthesis.
• What type(s) of carbon-based molecules (organic compounds) are the source for most of the energy in the foods you eat..
•Where is energy stored in these molecules
Answer:
Carbohydrates
The answer to this question is yes and no. All of the carbon- based molecules in food store chemical energy in their bonds. Carbohydrates and lipids are the most important energy sources in foods you eat. However, this energy is only usable after these molecules are broken down by a series of chemical reactions.
The carbon-based molecules (organic compounds) that are the source of most energy in the food you eat are carbohydrates. Carbohydrates store energy in their chemical bonds.
What are carbohydrates?Carbohydrates are one of the three primary nutrients included in foods and beverages, along with proteins and fats. Glucose is created by your body's breakdown of carbs.
The bonds in every carbon-based food molecule store chemical energy. The two main types of energy found in food are carbohydrates and fat. But only after a sequence of chemical events has broken down these molecules can this energy be put to use.
Therefore, Carbohydrates are the carbon-based molecules (organic substances) that make up the majority of the energy in the food you eat. Energy is stored in the chemical bonds of carbohydrates.
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Help me please
Daughter cells have the same number of chromosomes as the original parent cell.
a. Mitosis
B.meiosis
C. Both
Answer:
Mitosis
Explanation:
No crossing over
I need help, it is a math/science question and I don't understand it, may you please help? please and thank you.
Answer: B. Temperature of 35 degrees celsius
Explanation: It is highest at the point between 30 and 40, which is where it's activity is the strongest.
the part of blood that carries waste is
hemoglobin
platelets
white blood cells
plasma
Hurry, 30 mins, MAX.
Answer:
Plasma
Explanation:
Plasma carries water, salts, and enzymes. The main role of plasma is to take nutrients, hormones, and proteins to the parts of the body that need it. Cells also put their waste products into the plasma. The plasma then helps remove this waste from the body.
Answer: D. plasma
Explanation:
Can someone do my science work for me?
Answer:
It depends on the Work
Explanation:
