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: Energy is passed up a food chain or web from lower to higher trophic levels.

A: energy calories.
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Q: Fact: an animal needs to attract a mate to reproduce.

A: animal birth young.
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Q: Fact: a refrigerator is used for keeping food fresh for a long period of time.

A:
food chicken.
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