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: better senses have a positive impact on an animal 's survival.
animal survival senses.

Fact: sand dunes are formed by the wind transporting and depositing sand.
sand dune formation desert.

Fact: Female monotremes lack a uterus and vagina.

female monotremes.