Among Protostomes, Which Morphological Trait Has Shown The Most Variation?

(Correct Answer Below)

Among Protostomes, Which Morphological Trait Has Shown The Most Variation?

Hint: The phylogenetic tree on the last page of the exam might be helpful. A) type of symmetry (bilateral vs. radial vs. none) B) type of body cavity (coelom vs. pseudocoelom vs. acoelom) C) number of embryonic tissue types (diploblasty vs. triploblasty) D) direction of gastrulation (protostome vs. deuterostome)
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B

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