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Author Question: Which of the following must exist in a population before natural selection can a (Read 638 times)

hummingbird

  • Sr. Member
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  • Posts: 324
on: Jul 7, 2013
Which of the following must exist in a population before natural selection can act upon that population?
A) genetic variation among individuals
B) variation among individuals caused by environmental factors
C) sexual reproduction
D) Three of the responses are correct.
E) Two of the responses are correct.


Celeste

  • Hero Member
  • Posts: 588
Reply #1 on: Jun 19, 2019
A


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