Pearl ,coral ,conch ,oil name the group?
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Only pearls and coral belong tot he same group which is "molluscs". The chemical composition of pearls shows that it is a crystalline shape substance made up of CaCO3 i.e. calcium carbonate. Similarly "Conch" is made up of large calcinous shells and falls in the category of molluscs.
"Corals" are members of the phylum Cnidaria. These are found in the bottom of the sea.
"Oil" is a saturated black liquid and is extracted from the earth.
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