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

[EX Q]: Plant nutrition is the study of the chemical elements necessary for plant growth.
[EX A]: What is the study of the chemical elements necessary for plant growth called?

[EX Q]: There are three quarks in each proton and neutron.
[EX A]: How many quarks are in each proton and neutron?

[EX Q]: The structures of both trifluoramine and hydroxylamine are similar to that of ammonia.
[EX A]:
The structures of both trifluoramine and hydroxylamine are similar to that of what?