Respuesta :

lak521

Answer:

Only when variation among organisms is inherited from the previous generation, i.e. it has a genetic basis, will natural selection be able to occur. Natural selection cannot act on variation that is due purely to environmental conditions.

Oseni

A. Mutations to DNA

B. Variations in phenotypes of a trait

C. Selective pressures from the environment

D. A very small population size

The correct answer to which is not required for natural selection among the options is a very small population size. Thus, the correct answer is D.

Natural selection is a theory proposed by Charles Darwin. It refers to the process through which populations of organisms living in different environment adapt to changes to their environment. Within a population, individuals that are not able to adapt to the environment gradually fade off the population while those that are better suited multiply and dominate the population.  

  • A small population size is not required for natural selection because the entire population can easily be wiped out by a change to the environment due to the small genetic variation within the population.
  • Mutation to DNA can lead to natural selection if the mutation is beneficial.
  • Variations in phenotypes of a trait can be selected if such variations confer advantage to organisms.
  • Selective pressures from the environment is necessary for natural selection to occur. Without pressures, organisms do not need any changes to continually adapt to their environment.

More on natural selection can be found here: https://brainly.com/question/1657375

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