instruction:
Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
question:
Compounds containing an atom of nitrogen element, bonded in a hydrocarbon framework, are classified as amines.
answer:
Compounds containing an atom of what element, bonded in a hydrocarbon framework, are classified as amines?

question:
Cranium (skull) is the term for the skeletal structure of the head that supports the face and protects the brain.
answer:
What is the term for the skeletal structure of the head that supports the face and protects the brain?

question:
Snakes use their tongue to smell things.
answer:
What do snakes use to smell things?