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.

Input: Consider Input: Fact: Algae play significant roles as producers in aquatic ecosystems.

Output: Algae.


Input: Consider Input: Fact: the looseness of soil increases the amount of oxygen in that soil.

Output: increases the amount of oxygen in that soil.


Input: Consider Input: Fact: a mutation in the sex cells of a parent can cause a new trait to appear in the parent 's offspring.


Output: define offspring.


