1. how do corals form the reefs where they live? a. they use waste materials of fish to build reefs. b. they collect and cement sand to become reefs. c. they release the material for the reefs as aexcrement. d.they harvest calcium from the seawater and then secrete it as calcium corbonate.

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Eto yung explanation kung bakit letter D

1. how do corals form the reefs where they live? a. they use waste materials of fish to build reefs. b. they collect and cement sand to become reefs. c. they release the material for the reefs as aexcrement. d.they harvest calcium from the seawater and then secrete it as calcium corbonate.

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