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

[EX Q]: Pheromones enable communication, which is vital for organisms like ants that live in a large community.
[EX A]: Pheromones enable what, which is vital for organisms like ants that live in a large community?

[EX Q]: A decline in blood flow to kidneys organs stimulates release of the enzyme renin, in turn stimulating the reabsorption of sodium and water.
[EX A]: A decline in blood flow to what organs stimulates release of the enzyme renin, in turn stimulating the reabsorption of sodium and water?

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