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.

[EX Q]: Fact: a stopwatch is used to measure time.
[EX A]: Measuring time.

[EX Q]: Fact: creating paper requires cutting down trees.
[EX A]: cutting down trees causes harm to environment.

[EX Q]: 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.
[EX A]:
fish water animal.