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.

Fact: sexual reproduction increases genetic diversity.
genetic diversity creates evolution.

Fact: Viruses often infect bacteria.
bacteria define.

Fact: Bioterrorism is another potential threat in the environment.

Bioterrorism.