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.

[EX Q]: Fact: Population size influences the chances of a species surviving.
[EX A]: migration Population size.

[EX Q]: Fact: an animal requires energy to move.
[EX A]: animal energy from.

[EX Q]: Fact: riding a bike does not cause pollution.
[EX A]:
bicycle pollution.