Among protostomes, which morphological trait has shown the most variation?
A) type of symmetry (bilateral vs. radial vs. none)
B) type of body cavity (coelom vs. pseudocoelom vs. no coelom)
C) number of embryonic tissue types (diploblasty vs. triploblasty)
D) type of development (mouth first vs. anus first)

Question

Quizplus · Accepted Answer

Among protostomes, the type of body cavity (coelom vs. pseudocoelom vs. no coelom) has shown the most variation. This is because the body cavity is derived from different tissues and can form in different ways, leading to a range of variations in morphology. In contrast, the other traits listed (symmetry, embryonic tissue types, and type of development) are more conserved among protostomes.

Among Protostomes, Which Morphological Trait Has Shown the Most Variation