Question

how is genetic drift different from natural selection?
genetic drift occurs over the course of one generation, whereas natural selection requires many generations.
genetic drift only occurs in very small populations, whereas natural selection occurs in large populations.
genetic drift occurs when individuals migrate and reproduce with individuals from other populations.
genetic drift is caused by random chance, whereas natural selection is driven by environmental influences.

Explanation:

Genetic drift is a random - change in allele frequencies due to chance events, especially in small populations. Natural selection is the process by which organisms better adapted to their environment tend to survive and reproduce more successfully. It is driven by environmental factors.

Answer:

Genetic drift is caused by random chance, whereas natural selection is driven by environmental influences.