Why must there be variation in a population in order for natural selection to occur?

Answers

Answer 1

Answer: In natural selection, genotype variations that will increase the chance of survival and reproduction of some organism are preserved and will be inherited. If there is no variation, then all individuals have the same chance to survive and nothing will be particularly selected.

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What specifically is this biochemical used for, and how is it broken down during digestion?

Answers

digestion occurs in the stomach and the duodenum through the action of three main enzymes: pepsin, secreted by the stomach, and trypsin and chymotrypsin, secreted by the pancreas.During carbohydrate digestion the bonds between glucose molecules are broken by salivary and pancreatic amylase.The digestion of certain fats begins in the mouth, where short-chain lipids break down into diglycerides because of lingual lipase. The fat present in the small intestine stimulates the release of lipase from the pancreas, and bile from the liver enables the breakdown of fats into fatty acids.DNA and RNA are broken down into mononucleotides by the nucleases deoxyribonuclease and ribonuclease (DNase and RNase) that are released by the pancreas.

Which of the following examples of an ecological study involves the ecosystem level of organization?A. The effects of human activities on biogeochemical cycling
B. The effects of a disease on population size
C. The effects of an invasive plant species on bird nesting sites
D. The effects of competition on survival

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the closest answer to being correct is A, because ecosystem involves biotic and abiotic. and since humans are biotic and the cycle is abiotic. it is on the ecosystem level! :D

What do all the living things in an ecosystem make up?

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I think the answer is Community

Which forms the basis of taxonomy in the twenty-first century

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Taxonomy is the science of classifying organisms. The system currently used by taxonomists is called the Linnaean taxonomic system.

Which shows the levels of organizational hierarchy listed from least complex to most complex?population, community, ecosystem
ecosystem, population, community
community, population, ecosystem
community, ecosystem, population

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Community, population, ecosystem shows the levels of organizational hierarchy from least complex to most complex. The correct option among all the options that are given in the question is the third option. It is a fact that a community will always be smaller than the population, since numerous communities make up the population. Ecosystem is the largest.

The correct answer is: population, community, ecosystem.

A hydrocarbon has molecular formula C3H8. Identify the class of hydrocarbons it belongs to.

Answers

Answer:

Alkanes

Explanation:

There are 3 classes of hydrocarbons based on the on the presence of single, double and triple bond present in them. These classes are mentioned as under:

1) alkanes

2)alkenes

3)alkynes

Alkanes are the hydrocarbons which are compounds of carbon and hydrogen bonded by single bond. Their general formula is CnH2n+2 that means if in an alkane n = 3 then it will have 3 carbon and 2n+2 = 8 hydrogen molecules.

Alkenes are the hydrocarbons which are compounds of carbon and hydrogen bonded by double bond. Their general formula is CnH2n.

Alkynes are the hydrocarbons which are compounds of carbon and hydrogen bonded by triple bond. Their general formula is CnH2n-2.

As explained above, the given hydrocarbon is an alkane because its chemical formula is C3H8 which satisfies the condition for formula CnH2n+2 which is valid for alkanes.

It would belong to the group known as the Alkane which have the general form $C_(n) H_(2n + 2)$

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