Given scientific fact as input, generate the question from this fact such that it can be answered from the input.

Microevolution is the process by which organisms change in small ways over time.
What is the process by which organisms change in small ways over time?

The high points in a transverse wave are called crests.
What are the high points in a transverse wave called?

Biological membranes surround cells and serve to keep the insides separated from the outsides.

What is it that surrounds cells and serve to keep the insides separated from the outsides?