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

[EX Q]: Sexually do invertebrates reproduce.
[EX A]: How do invertebrates reproduce?

[EX Q]: Some materials have negative heats of solution; the dissolution of one of these solutes in water is called?
[EX A]: Some materials have negative heats of solution; the dissolution of one of these solutes in water is called?

[EX Q]: Sun does the stratosphere get most of its heat.
[EX A]:
Where does the stratosphere get most of its heat?