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: cycles of freezing and thawing water cause ice wedging.

A: freezing thawing ice.
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Q: Fact: Invertebrates are animals that lack a vertebral column, or backbone.

A: Invertebrate.
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Q: Fact: the ovaries are used in reproduction.

A:
humans reproduction.
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