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

Population is an important level of organization in ecology and the unit of microevolution.
What is an important level of organization in ecology and the unit of microevolution?

Low energy causes waves to bring sand up onto the beach during summers.
What causes waves to bring sand up onto the beach during summers?

Water makes up most of  biological tissues.
What makes up most of  biological tissues?