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Q: Coral reefs 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
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Answer : 4. "tiny colonial marine animals which construct limestone skeleton material"
Explanation :

Answer: D) tiny colonial marine animals which construct limestone skeleton material Explanation:

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