instruction:
Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
question:
Chewing insects such as dragonflies and grasshoppers have two many sets of jaws.
answer:
Chewing insects such as dragonflies and grasshoppers have how many sets of jaws?


question:
Certain air pollutants form acid liquid when dissolved in water droplets in the air.
answer:
Certain air pollutants form which liquid when dissolved in water droplets in the air?


question:
Evolution process consists of the mechanisms that produce an observed pattern of change.
answer:

What process consists of the mechanisms that produce an observed pattern of change?