The protostome developmental sequence arose just once in, Ask an Expert

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The protostome developmental sequence arose just once in evolutionary history, resulting in two main subgroups-Lophotrochozoa and Ecdysozoa. What does this finding suggest?

1) The protostomes are a polyphyletic group.
2) Division of these two groups occurred after the protostome developmental sequence appeared.
3) These two subgroups have a common ancestor that was a deuterostome.
4) The lophotrochozoans are monophyletic.

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Category:- Biology
Reference No.:- M9391010

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