The three factors that are needed for natural selection to occur are variation, overpopulation, and adaptation.
Option (B), (C), and (D) are correct.
Natural selection is a process of better adapting and survival of animals.
Those who adapt themselves to changing environments are more likely to survive and pass their gene to the next generation.
Variation is the different types o population present in an environment. Variation causes natural selection.
Overpopulation is also e reason for natural selection. The more the population, the more there is competition between organisms that cause natural selection.
Adaptation is the main character of natural selection, the better the organism adapts itself there is more chance for its survival.
Thus, option (B)variation, (C)overpopulation, and
(D)adaptation are correct options.
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