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: a seismograph is used for measuring the size of an earthquake.
earthquakes can cause damage.

Fact: Bivalves feed on plankton and nonliving organic matter.
Bivalve.

Fact: tadpole changes into a frog.

frog.