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.

Q: Fact: using renewable resources to generate power reduces greenhouse gases.

A: greenhouse gas carbon.
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Q: Fact: the Earth revolving around the Sun causes the seasons to change on its axis.

A: earth axis.
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Q: Fact: Cytokinesis is the final stage of cell division in eukaryotes as well as prokaryotes.

A:
Cytokinesis.
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