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

A crater can usually be found on the top of composite volcanoes.
A crater can usually be found on the top of what kind of volcanoes?

The heterotroph eats only or mainly plants.
The heterotroph eats only or mainly what?

Divide and reproduce cells does the cell cycle do.

What does the cell cycle do?