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: Specialization occurs when competing species evolve different adaptations.

A: adaptations.
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Q: Fact: Hydrogen bonds cause water to expand when it freezes.

A: freezes.
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Q: Fact: a nest is used for protecting young by birds.

A:
bird nest.
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