instruction:
Given a statement, generate a question such that the answer is contained in that statement.
question:
muscles contracting cause a person's arm to straighten
answer:
What causes a person's arm to straighten?

question:
Small-sized viviparous mammals evolved by Jurassic times.
answer:
When did small-sized viviparous mammals evolve?

question:
Frogs make noises with the larynx which is in the throat.
answer:
What is in the throat?