Absence of head, unsegmented body and endoske | vedclass

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(C) The phylum $Echinodermata$ is characterized by the presence of an endoskeleton of calcareous ossicles (dermal calcareous plates).These organisms l

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Echinodermata

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(C) The phylum $Echinodermata$ is characterized by the presence of an endoskeleton of calcareous ossicles (dermal calcareous plates).These organisms lack a distinct head and their body is unsegmented (though they exhibit radial symmetry in adults).Therefore, these specific features are diagnostic characters of the phylum $Echinodermata$.

Absence of head, unsegmented body and endoskeleton of dermal calcareous plate are the characters of

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