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

[EX Q]: A fewer predators is most likely to cause the number of rabbits living in an area to increase.
[EX A]: Which factor is most likely to cause the number of rabbits living in an area to increase?

[EX Q]: Toxins is contained in the skin of brightly colored poison dart frogs.
[EX A]: What is contained in the skin of brightly colored poison dart frogs?

[EX Q]: The pharynx is the name of the tube that joins the mouth to the digestive and respiratory tracts.
[EX A]:
What is the name of the tube that joins the mouth to the digestive and respiratory tracts?