Q: Given a scientific passage and an answer, generate a question for the given answer.
Passage: Evolution that occurs over a short period of time is known as microevolution . It might take place in just a couple of generations. This scale of evolution occurs at the level of the population. The Grants observed evolution at this scale in populations of Darwin's finches. Beak size in finch populations changed in just two years because of a serious drought. Answer: microevolution
A:
Evolution that occurs over a short period of time is known as what?