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

Ex Input:
Humans have 23 pairs pairs of chromosomes.

Ex Output:
How many pairs of chromosomes do human have ?

Ex Input:
Evolution occurs by natural selection, a process whereby better-adapted members pass along their traits, according to darwin.

Ex Output:
Evolution occurs by what process whereby better-adapted members pass along their traits, according to darwin?

Ex Input:
The mouth is the first digestive organ that food enters.

Ex Output:
What is the first digestive organ that food enters?