instruction:
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.
question:
Fact: gravity pulls objects towards planets.
answer:
gravity objects planets.


question:
Fact: tidal energy can be used to produce electricity.
answer:
electricity current.


question:
Fact: a long tail can be used to move through water by an animal.
answer:

long tail can be used to move through water.