Adaptation of a species is its

Assertion : Natural selection is the outcome of difference in survival and reproduction among individuals that show variation in one or more traits.
Reason : Adaptive forms of a given trait tend to become more common; less adaptive ones become less common or disappear.

Which of the following factors causes a population to experience the founder effect?

Which of the following concepts is attributed to Charles Darwin?

Which of the following is the most important factor for speciation?

The theory of natural selection is based on which of the following?