TASK DEFINITION: Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
PROBLEM: Aerobic exercise helps improve the cardiovascular system, while anaerobic exercise causes muscles to get bigger and stronger.

SOLUTION: Aerobic exercise helps improve the cardiovascular system, while what exercise causes muscles to get bigger and stronger?

PROBLEM: Muscle groups are controlled by the motor cortex .

SOLUTION: Muscle groups are controlled by what mechanism?

PROBLEM: A student should use a balance to compare the masses of two small rocks.

SOLUTION:
Which tool should a student use to compare the masses of two small rocks?