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: Organs of excretion make up the excretory system.

A: Organs of excretion kidney.
****
Q: Fact: Endocrine hormones travel throughout the body in the blood.

A: Endocrine deficiency.
****
Q: Fact: Fish have a circulatory system with a two-chambered heart.

A:
fish aquatic animals.
****