Which of the following is an example of a biotic limiting factor in an ecosystem?

A. New predators move into the ecosystem.

B.A drought occurs for several months.

C.hurricane passes through an ecosystem.

D.Living space is lost due to human activities.

The allele frequencies of populations won't change; the populations must have a large breeding population, random mating,must occur, no change in allelic frequency can occur due to mutation, no immigration or emigration, (must be isolated) and no natural selection can occur.