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: Absorption of nutrients occurs mainly in the small intestine.

A: Absorption of nutrients.
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Q: Fact: Infancy is the period of most rapid growth after birth.

A: Infancy.
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Q: Fact: Phytoplankton are bacteria and algae that use sunlight to make food.

A:
Phytoplankton.
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