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

[EX Q]: Water, air, and milk list includes only examples of matter that can take the shape of a container.
[EX A]: Which list includes only examples of matter that can take the shape of a container?

[EX Q]: If two populations do not mate and produce fertile offspring, separate species result.
[EX A]: If two populations do not mate and produce fertile offspring, what results?

[EX Q]: Metabolic enzymes catalyze catabolic reactions that break down carbohydrates.
[EX A]:
Metabolic enzymes catalyze catabolic reactions that break down what?