instruction:
Given a statement, generate a question such that the answer is contained in that statement.
question:
Small-sized viviparous mammals evolved by Jurassic times.
answer:
When did small-sized viviparous mammals evolve?


question:
Cryptic coloration is used for protection by fish against predators
answer:
What is used for protection by fish against predators?


question:
Ejaculation is semen passing out of the body through the penis.
answer:

Ejaculation is semen passing out of the body through what?