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

Q: Opaque is the term for matter that does not let any light pass through.

A: What is the term for matter that does not let any light pass through?
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Q: All of the populations that live in the same area make up a(n) community, which includes populations of different organisms.

A: All of the populations that live in the same area make up what type of group, which includes populations of different organisms?
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Q: The study of energy and energy transfer involving physical matter is called thermodynamics.

A:
The study of energy and energy transfer involving physical matter is what?
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