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: Fission takes place when an animal divides into two parts.
[A]: animal  mitosis.


[Q]: Fact: Sponges are a source of food for many species of fish.
[A]: fish marine animals.


[Q]: Fact: a greenhouse is used to protect plants by keeping them warm.
[A]:
greenhouse plant.