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: Some parasites live on the surface of their host.
[A]: Surface parasite.


[Q]: Fact: being exposed to wind can cause erosion of soil.
[A]: being exposed to wind can cause erosion of soil.


[Q]: Fact: Courtship is behavior that is intended to attract a mate.
[A]:
Courtship mate.