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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
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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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