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: cycles of freezing and thawing water cause ice wedging.

Output: freezing thawing ice.


Input: Consider Input: Fact: Energy is passed up a food chain or web from lower to higher trophic levels.

Output: energy calories.


Input: Consider Input: Fact: Flowers form on the dominant sporophyte plant.


Output: Flowers are  reproductive parts.