Which coastal ecosystem is built by colonies of corals in warm, shallow seas?

Which coastal ecosystem is built by colonies of corals in warm, shallow seas?

• A. Coast
• B. Delta
• C. Coral Reef
• D. Breakwater

Answer: (C)

Coral reefs are built by colonies of coral polyps that secrete calcium carbonate, forming substantial underwater structures in warm, shallow seas. The warmth and plenty of sunlight in these waters enable the corals’ symbiotic algae to photosynthesize, providing energy that drives rapid reef growth. Over time, many generations of corals accumulate into a large, complex habitat that supports a wide variety of marine life and helps protect shorelines from waves. This description fits a coral reef. A coast is simply the land–sea boundary, not a framework built by living organisms. A delta is formed by abundant sediment deposited where a river meets the sea, not by coral growth. A breakwater is a human-made structure placed to protect a shore, not a biological ecosystem created by corals.

Coral reefs are built by colonies of coral polyps that secrete calcium carbonate, forming substantial underwater structures in warm, shallow seas. The warmth and plenty of sunlight in these waters enable the corals’ symbiotic algae to photosynthesize, providing energy that drives rapid reef growth. Over time, many generations of corals accumulate into a large, complex habitat that supports a wide variety of marine life and helps protect shorelines from waves.

This description fits a coral reef. A coast is simply the land–sea boundary, not a framework built by living organisms. A delta is formed by abundant sediment deposited where a river meets the sea, not by coral growth. A breakwater is a human-made structure placed to protect a shore, not a biological ecosystem created by corals.