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: Vertebrates are animals that have a backbone.
backbone muscles move.

Fact: a warm front causes cloudy and rainy weather.
cloudy and rainy weather.

Fact: Chromosomes are the form of the genetic material of a cell during cell division.

cell division mitosis.