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.

Input: Consider Input: Fact: Fish have a circulatory system with a two-chambered heart.

Output: fish aquatic animals.


Input: Consider Input: Fact: Vertebrate chordates have a backbone.

Output: Vertebrate chordates bear.


Input: Consider Input: Fact: Tunicates reproduce sexually.


Output: sexual reproduction requires two organisms.