Members of which group are not deuterostomes?

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(C) Deuterostomes are animals in which the first opening to develop in the embryonic digestive tube is the anus,and the mouth is formed later.Echinode

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Arthropods

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(C) Deuterostomes are animals in which the first opening to develop in the embryonic digestive tube is the anus,and the mouth is formed later.Echinoderms and chordates exhibit a deuterostomic body plan.In contrast,annelids,arthropods,and molluscs exhibit a protostomic body plan,where the mouth develops first from the blastopore.

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