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OpenStudy (anonymous):

The higher invertebrates are divided into two evolutionary lines, protostomes and deuterostomes. This division is based on which developmental feature? i could really use some help here

OpenStudy (tywower):

in deuterostomes, the first opening developing during embryonic development becomes the anus, while in protostomes the first opening becomes the mouth.

OpenStudy (tywower):

medal plss

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