Which of the following must exist in a population before natural selection can a

Author Question: Which of the following must exist in a population before natural selection can a (Read 625 times)

hummingbird

Sr. Member
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

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