As stated in the text, "DNA sequence data indicated that two major subgroups existed within the protostomes." This finding contradicts the long- held hypothesis that the protostomes are a monophyletic group.

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The finding that there are two major subgroups within protostomes does not contradict the hypothesis that protostomes are monophyletic; it suggests that protostomes share a common ancestor but have diverged into distinct lineages.

As Stated in the Text, "DNA Sequence Data Indicated That