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The higher invertebrates are divided into two evolutionary lines, protostomes and deuterostomes. This division is based on which developmental feature?
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The higher invertebrates are divided into two evolutionary lines, protostomes and deuterostomes. This division is based on which developmental feature?

User Abhik Bose Pramanik
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7 votes

Answer:

the answer is A

Step-by-step explanation:

User Firas Shrourou
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whether the mouth is developed from the first or second opening.
User Stuart Gough
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