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A coral reef is an underwater ecosystem characterized by reef-building corals. Reefs are formed of colonies of coral polyps held together by calcium carbonate.[1] Most coral reefs are built from stony corals, whose polyps cluster in groups.

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Fish hooks can catch onto coral reefs.

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Coral Crisis: Can scientists save the world 's coral reefs?

One of the causes of coral reefs destruction is coral reef bleaching. People also threaten coral reefs.

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MYON - book - Coral Reefs - When the water rises coral loses algae.

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Epic - Coral Reef Matters - pg 42 -43

Coral reef destruction is caused by chemicals like fertilizer because the Chemicals get washed up into the Ocean.

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Poisonous chemicals can kill coral reefs.

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The fisherman then rip apart the reefs with crowbars to capture the fish. In addition, cyanide kills coral polyps and the symbiotic algae and other small organisms necessary for healthy reefs. Cyanide fishing is common in the South Pacific and Southeast Asia.

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EPIC-  Coral Reefs Matter- p 6. Coral is made of thousands of  tiny little creatures called polyps. Coral polyps have soft bodies that measure from 0.04 to 0.1 inches. Tentacles around their mouths sting and catch tiny organisms that drift past. That's how it eats.