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

Ex Input:
Induced or spontaneous are the two methods in which mutations arise in dna.

Ex Output:
What are the two methods in which mutations arise in dna?


Ex Input:
Producing sperm and secreting testosterone are the main functions of male reproductive system system.

Ex Output:
Producing sperm and secreting testosterone are the main functions of what system?


Ex Input:
Molecules of gas are rare in exosphere outermost region of the planet's atmosphere.

Ex Output:

Molecules of gas are rare in what outermost region of the planet's atmosphere?