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: seasons cause change to the environment.
[A]: environment animal habitat.


[Q]: Fact: a nest is used for protecting young by birds.
[A]: bird nest.


[Q]: Fact: a car engine usually converts gasoline into motion and heat through combustion.
[A]:
car engine combustion.