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: if fossils of a water animal or plant are found in a place then that place used to be covered by water in the past.
fish water animal.

Fact: cross-pollination increases genetic diversity.
cross-pollination.

Fact: if an object reflects light toward the eye then that object can be seen.

light beams.