TASK DEFINITION: Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
PROBLEM: An excellent solvent that holds heat well and allows hydrogen bonds, water substance has many properties critical to life.

SOLUTION: An excellent solvent that holds heat well and allows hydrogen bonds, what substance has many properties critical to life?

PROBLEM: A crater can usually be found on the top of composite volcanoes.

SOLUTION: A crater can usually be found on the top of what kind of volcanoes?

PROBLEM: 8 is the diploid number for fruit flies.

SOLUTION:
What is the diploid number for fruit flies?