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: Monotremes are mammals that reproduce by laying eggs.
hatch reproduction egg.

Fact: Differentiation is the process by which unspecialized cells become specialized.
cell Differentiation.

Fact: a drought can change the color of an environment from green to brown.

a drought.