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: Fish have a circulatory system with a two-chambered heart.
[A]: fish aquatic animals.


[Q]: Fact: the Earth revolving around the Sun causes the seasons to change on its axis.
[A]: earth axis.


[Q]: Fact: the mass of a planet causes the pull of gravity on that planet.
[A]:
earth planet.