4,347 Answered Questions for the topic Science

10/18/21

A positive correlation between genetic differentiation and geographic distance (isolation by distance) is expected from what type of model?
I think it is B, I tried googling it, but I am very confused. A) Wright-Fisher Model with MigrationB) Continent-Island Model of Migration C) Stepping-Stone Models D) Isolation-with-Migration Models
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Science Biology Genetics

10/18/21

If migration rates are high, then ____________________________________.
I think the answer is C, but I am not sure. I think dependent because migration and mutations allele frequency will be affected in multiple populations. A) different alleles will become fixed in... more
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Science Biology Genetics

10/18/21

What does it mean if something is stochastic?
I think the answer is C because if you have a bunch of data you can find the avg. and potentially predict what may happen next. So maybe you can predict the probability of a mutation in a... more
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Science Biology Genetics

10/18/21

Which of the following statements is true about the equilibrium frequency?
Hi, I think the answer is C because when the mutations even out, they ,maybe will become fixed. I'm not sure though because I know hardy Weinberg equilibrium occurs when there are no mutations.... more
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Science Biology Genetics

10/18/21

If a mutation is irreversible, then the original allele will eventually go extinct in the population. (True or False)
I said it was false because I think the original allele can be recessive and also I think it means that mutation will become fixed.
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10/18/21

Please help me with this question
Mr. Jim had R total hip replacement 1 day ago. He's having trouble coughing up secretions after her surgery, complaining of SOB & a sensation of "tightness" in his chest, pale & sweating.... more
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10/18/21

When are Alleles identical by descent?

A) they are molecularly indistinguishable. B) they are functionally equivalent. C) they are derived from the same ancestral copy. I believe it's the last one, but I am not sure.
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10/18/21

Which of the following forces always adds genetic diversity?
A) MutationB) Genetic driftC) MigrationD) Selection(i think the answer is mutation, but I'm not sure)
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Science Biology

10/17/21

Two populations of birds with somewhat different coloration live on opposite sides of a peninsula....
Two populations of birds with somewhat different coloration live on opposite sides of a peninsula. The habitat between the populations is not suitable for these birds. When birds from the two... more
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Science Geology

10/17/21

Biogeochemical Cycles
Why is cycling ______important? (Choose one: carbon, water, nitrogen). Be specific and use appropriate terminology specific to your chosen cycle.
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Science Biology

10/16/21

Atmospheric questions

How does fossil fuel usage affect atmospheric CO2?Question - How does plant biomass (amount of plants) affect atmospheric CO2? Prompt Your Response Claim Statement that answers the question... more
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Science Chemistry

10/13/21

Which of the following statements is true?
A. Activation energy is the energy necessary to start a chemical reaction.B. The gaseous state has the highest amount of entropy associated with it.C. Enthalpy of formation is the change in... more
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Science Chemistry

10/13/21

Which of the following has a △Hf of zero?
_______ has a ΔHf of zero.A. Br-B. Na+C. H2OD. CO2E. O2For this I got E. O2 Would this happen to be correct?
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Science Chemistry

10/13/21

Are my answers to these Chemistry problems correct?
In the equation ΔHo = Σ ΔHfo (products) – Σ ΔHfo (reactants), ΔHo stands for _______.A. standard change of enthalpyB. standard change of entropyC. change in heatD. change in hydrogen bondsE. None... more
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Science Chemistry

10/13/21

potassium nitrate reacts with copper (I) sulfite, how do you predict the product?
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Science Chemistry Physics

10/11/21

Write down one possible random and systematic error that may occur.
 Calculating acceleration due to gravity using a simple pendulum  Finding density of an irregular shaped object  Using a ball in a table to compare free fall and projectile motion
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10/10/21

What is the number of moles from this chemical equation below?
2NaOH(aq) + CaBr2(aq) ==> Ca(OH)2 + 2NaBr(aq)
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10/10/21

What is the type of reaction of this balanced equation?
2NaOH(aq) + CaBr2(aq) ==> Ca(OH)2 + 2NaBr(aq)
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10/10/21

What is the number of particles or formula units of this chemical eqution?
2NaOH(aq) + CaBr2(aq) ==> Ca(OH)2 + 2NaBr(aq)
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10/08/21

According to most climate scientists, how are humans contributing to Earth’s current warming trend?
According to most climate scientists
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10/08/21

Fish blood cells
Why do fish blood cells contain a nucleus?
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Science Math Physics

10/07/21

...mara's walk consists of
Mara's walk consists of four legs with the following magnitude and direction:A = 85 m, 30 deg North of EastB = 135 m, NorthC = 85 m, 210 degD = 135 m, SouthDetermine the magnitude and direction of... more
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Science Chemistry

10/05/21

Can someone please help me with this Chemistry problem?
For the equation CH4 + 2O2 → CO2 + H2O + 803.1 kJ, how much heat will be released if 2.0 × 101 g of CH4 react with sufficient O2? A. 883 kJB. 883 kJ/molC. 1.0 × 103 kJD. 1.0 × 103 kJ/molE. None of... more
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Science Chemistry

10/05/21

An atom and a molecule of sodium is identical, while an atom and a molecule of oxygen are not. Give reason for the above statement.
Please answer the question As soon as possible :D
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10/04/21

I really need help with this question please and thank you!
When 1.00-gram sample of baking soda is heated, a gas is formed. The solid that remains weighs less than 1.00 g and does not have the same properties as the original sample. Is the baking soda an... more
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