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

[EX Q]: A moose eats a plant is an example of a living thing that depends on another living thing to survive.
[EX A]: Which statement best identifies a living thing that depends on another living thing to survive?

[EX Q]: The pupil is the name of the black opening in the eye that lets light enter.
[EX A]: What is the name of the black opening in the eye that lets light enter?

[EX Q]: The majority of solids are crystalline in nature.
[EX A]:
The majority of solids are what in nature?