Ecdysozoans are a monophyletic group characterized by their ability to molt or shed their exoskeletons through a process called ecdysis. This exoskeleton, also called a cuticle, is composed of protein and chitin. Not all ecdysozoans have a thick, hard exoskeleton, nor do they all have jointed appendages. However, they do all share the trait of having a cuticle.

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Ecdysozoans

Question 139

Multiple Choice

Ecdysozoans

A) are a polyphyletic group.
B) all have a thick, hard exoskeleton.
C) all have an exoskeleton that is composed of protein and chitin.
D) all have a cuticle.
E) all have jointed appendages.

Correct Answer: