User:isaac8b23bun6

Zoanthid "skeletons": Animals On this order of maritime benthic cnidarians connected to corals and sea anemones, include sand into their mesoglea for structural toughness, which they need because they deficiency a real skeleton.

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https://adysaputro23.blogspot.com/2015/06/jual-fungsi-antrasit-garnet-sand-pasir.html