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

[EX Q]: Compound does the precise pattern of a crystal depend on.
[EX A]: What does the precise pattern of a crystal depend on?

[EX Q]: If two populations do not mate and produce fertile offspring, separate species result.
[EX A]: If two populations do not mate and produce fertile offspring, what results?

[EX Q]: Electromagnetism magnetism is produced by electricity.
[EX A]:
What magnetism is produced by electricity?