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

Q: A skeleton that consists of hard, mineralized structures located within the soft tissue of organisms is called endoskeleton.

A: A skeleton that consists of hard, mineralized structures located within the soft tissue of organisms is called what?
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Q: If two populations do not mate and produce fertile offspring, separate species result.

A: If two populations do not mate and produce fertile offspring, what results?
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Q: Vinegar is an example of carboxylic type of acid.

A:
Vinegar is an example of what type of acid?
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