Answer :
Answer: Variability
Explanation: Organisms can't go through natural selection unless they have genetic differences from each other.
Answer:
D. variation.
Explanation:
In order for natural selection to occur, Charles Darwin stated we must begin with a population that has genetic variation. The genetic variation allows some members of the population to have traits, like a certain color, that helps them to survive. If an organism survives, it reproduces, and then passes those traits on to the offspring.