Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
--------
Question: Hookworms infest the intestines.

Answer: What part of the body do hookworms infest?


Question: Compression zones is the opposite of rarefaction zones, where air molecules in waves are loosely packed.

Answer: What is the opposite of rarefaction zones, where air molecules in waves are loosely packed?


Question: Natural selection is the process that allows organisms with better traits to survive and produce.

Answer:
What is the process that allows organisms with better traits to survive and produce?