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: condensation is when change from a gas into a liquid by reducing heat energy.
[EX A]: condensation gas liquid.

[EX Q]: Fact: Plants exhibit phototropism, or growing toward a light source.
[EX A]: electricity can produce light.

[EX Q]: Fact: skin is used for breathing air by frogs.
[EX A]:
air oxygen.