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: camouflage is used for protection by prey against predators.

A: camouflage animals.
****
Q: Fact: Echinoderms lack a centralized nervous system.

A: Echinoderms sand dollar.
****
Q: Fact: when a body of water receives more water than it can hold , a flood occurs.

A:
body of water river.
****