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

Q: Warm and humid temperature and moisture conditions describe an air mass that originates over the atlantic ocean near the equator.

A: Which temperature and moisture conditions describe an air mass that originates over the Atlantic Ocean near the equator?
****
Q: The mesopause is at the top of the mesosphere.

A: What is at the top of the mesosphere?
****
Q: A healthy immune system fights off infections and other dieases.

A:
What does a healthy immune system fight off?
****