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: Skin color is another polygenic trait.
polygenic loci.

Fact: when a gas in an open container evaporates , that gas spreads out into the air.
air contamination.

Fact: Plants respond to daily and seasonal cycles and to disease.

plant flower.