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

[EX Q]: Biodiversity is the term for the measurement of the amount of variation of species in a given area.
[EX A]: What is the term for the measurement of the amount of variation of species in a given area?

[EX Q]: Evolution occurs by natural selection, a process whereby better-adapted members pass along their traits, according to darwin.
[EX A]: Evolution occurs by what process whereby better-adapted members pass along their traits, according to darwin?

[EX Q]: A sudden flow of mud is called a(n) mudflow.
[EX A]:
What's it called when there's a sudden flow of mud?