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: Female mammals have mammary glands.
[A]: female mammals.


[Q]: Fact: unequal heating of Earth 's surface by the Sun causes global wind patterns.
[A]: earth our planet.


[Q]: Fact: harming an animal species causes that animal 's population to decrease.
[A]:
animal fish.