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.

Fact: Polyps usually reproduce asexually.
Coral polyp.

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

Fact: Earth 's magnetic patterns are used for finding locations by animals that migrate.

animals migrate.