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Biology 10 Online
OpenStudy (anonymous):

The higher invertebrates are divided into two evolutionary lines, protostomes and deuterostomes. This division is based on which developmental feature? a.whether the blastopore ultimately develops into a mouth or an anus b.whether the embryonic cells undergo spiral or radial cleavage c.whether the coelom forms by splitting the mesoderm or through the pocket of the gut

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