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pgkwsckp givvndj voted up Rooster Cogburn's answer

From a previous blurtit answer and very good also.

Seashells are one example of non-living things in a coral reef; there will be many seashells in evidence in a typical coral reef...some will be alive, and some will be non-living. For example, an oyster may be alive, but a cracked mussel shell will be non-living.

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