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: cables are used for support by suspension bridges.
[A]: cables are metal.


[Q]: Fact: planting trees has a positive impact on an ecosystem.
[A]: an ecosystem.


[Q]: Fact: Populations of viruses do not grow through cell division because they are not cells.
[A]:
cell division mitosis.