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Select all that apply.

All animals, except for _____, develop as a protostome.

sponges
mollusks
arthropods
echinoderms
vertebrates
chordates

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Sponges, echinoderms, vertebrates, and chordates are not Protostome.

Answer: Sponges, echinoderms, vertebrates, and chordates.

Protosome is the clade or group of animals in which the first opening in the embryo becomes the mouth. It represents all those animals that have a true body cavity and which share common ancestry. They include annelids, mollusks and arthropods. Sponges, echinoderms, vertebrates, and chordates do not develop as a protosome.

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