instruction:
Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
question:
Three many pairs of autosomes are there.
answer:
How many pairs of autosomes are there?


question:
A human cannot survive the loss of the liver of the following.
answer:
A human CANNOT survive the loss of which of the following?


question:
Because all animals require an external source of food, they are called heterotrophic.
answer:

Because all animals require an external source of what, they are called heterotrophic?