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Cities in the sea

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What are polyps?

Polyps are tiny organisms that form the structure of coral reefs.

Things that are threatening the health of coral reefs are . . .

1). People catch too many reef fish and often damage the reefs. 2). Polluted water as a certain type of algae grows in dirty water. 3). Global warming

What is the main purpose of the article?

The main purpose of the article is to explain why coral reefs are important.

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