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

[EX Q]: If a gas in a closed area experiences increases in pressure and decreases in temperatures, the volume of the gas will be affected.
[EX A]: If a gas in a closed area experiences increases in pressure and decreases in temperatures, what other attribute of the gas will be affected?

[EX Q]: Moving air masses is the main reason for weather change.
[EX A]: What is the main reason for weather change?

[EX Q]: Most hormones are produced by the endocrine system.
[EX A]:
Most hormones are produced by which human organ system?