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: Alternation of generations allows for both asexual and sexual reproduction.
[EX A]: alteration of generations.

[EX Q]: Fact: Running water is better able to dissolve oxygen and nutrients than standing water.
[EX A]: nutrients minerals.

[EX Q]: Fact: a sifter is used for separating mixtures.
[EX A]:
Sifter.