The higher invertebrates are divided into two evolutionary lines, protostomes and deuterostomes. This division
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The higher invertebrates are divided into two evolutionary lines, protostomes and deuterostomes. This division

[From: ] [author: ] [Date: 12-04-19] [Hit: ]
the first opening developing during embryonic development becomes the anus, while in protostomes the first opening becomes the mouth.......
The higher invertebrates are divided into two evolutionary lines, protostomes and deuterostomes. This division is based on which developmental feature?

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I am not exactly sure what you are asking, but I think that what you are looking for is that in deuterostomes, the first opening developing during embryonic development becomes the anus, while in protostomes the first opening becomes the mouth.
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