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

[Q]: Fruit food provides the most energy for the body in the shortest amount of time.
[A]: Which food provides the most energy for the body in the shortest amount of time?


[Q]: Terrestrial biomes are classified by climatic factors and types of primary producers.
[A]: What are classified by climatic factors and types of primary producers?


[Q]: Nitrogen gas comprises about three-fourths of earth's atmosphere.
[A]:
What gas comprises about three-fourths of earth's atmosphere?