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: Ethologists usually study how animals behave in their natural environment.
Ethologists.

Fact: Bioterrorism is the intentional release or spread of agents of disease.
agents of disease.

Fact: Adolescence is a time of significant mental, emotional, and social changes.

Adolescence.