Which statement about ecdysozoans is true?
A) All are wormlike, and their Hox genes indicate they are polyphyletic.
B) All have a thin cuticle, and molting evolved several times.
C) The hard exoskeleton is composed of chitin and is does not fossilize.
D) All possess a cuticle, and their Hox genes indicate they are monophyletic.
E) They are all marine forms, and all exchange gases through the body wall.
Correct Answer:
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