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

[Q]: A change of season and less food usually cause certain animals to migrate.
[A]: Which two environmental changes usually cause certain animals to migrate?

[Q]: Cells are the basic building blocks of the human body.
[A]: What are the basic building blocks of the human body?

[Q]: A synthetic diamond is not considered a mineral because minerals must be created naturally.
[A]:
Why is a synthetic diamond not considered a mineral?