Multiple choice

Coral reffs are formed by

  1. Volcanic rocks

  2. Marine sediments

  3. Chlorine material precipitated from sea water

  4. Tiny colonial marine animals which construct limestone skeleton material
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Coral reefs are constructed by tiny colonial marine animals called coral polyps, which extract calcium carbonate from seawater to build hard limestone skeletons. These organisms live in symbiosis with algae and create massive reef structures over time.

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