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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? Select one: a. These two subgroups have a common ancestor that was a deuterostome. b. The protostomes are a polyphyletic group. c. Division of these two groups occurred after the protostome developmental sequence appeared. d. The lophotrochozoans are monophyletic.
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The protostome developmental sequence arose just once in evolutionary history, resulting in two main...
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