instruction:
Given a statement, generate a question such that the answer is contained in that statement.
question:
a telescope is used for observing the sun
answer:
What is used for observing the sun?


question:
Muscles in the upper arm shrinking causes a person 's elbow to straighten.
answer:
What causes a person's elbow to straighten?


question:
An animal with an additional joint in its mandible became more mammal-like as it continued to evolve
answer:

What did an animal with an additional joint become?