Given a statement, generate a question such that the answer is contained in that statement.

[EX Q]: Ejaculation is semen passing out of the body through the penis.
[EX A]: Ejaculation is semen passing out of the body through what?

[EX Q]: Non-vascular plants play vital roles as producers in aquatic ecosystems.
[EX A]: What plants play vital roles as producers in aquatic ecosystems?

[EX Q]: cruising may require a compass.
[EX A]:
What type of compass is required for cruising?