In this task, you need to write a topic word from the given fact. The topic word must have at least one word overlap with the given fact. The topic word often involves adding a new word from a related concept. In your topic word, use at least one word from the given fact. Topic words with two or more words work best.

Q: Fact: water vapor condensing in clouds causes rain.

A: clouds vapor.
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Q: Fact: Scientists who find and study fossils are called paleontologists.

A: fossil dinosaur bones.
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Q: Fact: Cells are the basic units of the structure and function of living things.

A:
cells require energy.
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