Who stated that human population grows geometrically?

Genetic drift is observed only in which of the following?

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.

$A$ population splits into two or more groups and these groups occupy different ecological zones. This is known as:

Which is the basis of evolution?

Who proposed the idea of mutations based on his work on plants?