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: sonar is used to find the location of an object.

A: Location of an object.
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Q: Fact: Bryophytes occupy niches in moist habitats.

A: bryophytes.
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Q: Fact: Nephrons are the structural and functional units of the kidneys.

A:
Nephrons cause.
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