Ammonites are fossil shell remains of

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(B) Ammonites are an extinct group of marine invertebrate animals in the subclass $Ammonoidea$ of the class $Cephalopoda$.They are well-known index fo

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Cephalopods

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(B) Ammonites are an extinct group of marine invertebrate animals in the subclass $Ammonoidea$ of the class $Cephalopoda$.They are well-known index fossils,and it is often assumed that they branched from within the $Coleoidea$ (the subclass containing octopuses,squids,and cuttlefish).Therefore,ammonites are fossil shell remains of cephalopods.

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