instruction:
Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
question:
The heterotroph eats only or mainly plants.
answer:
The heterotroph eats only or mainly what?


question:
A concave lens is thicker at the edges than it is in the middle.
answer:
What type of lens is thicker at the edges than it is in the middle?


question:
Methyl groups are found within amino acids.
answer:

Methyl groups are found within what?