1.) what is one distinguishing feature of chordates? What are some examples of chordates? 2.) Do vertebrates have an endoskeleton or exoskeleton? What are some examples of vertebrates?

i would say d

explanation:

the cladogram shown here shows similarities and differences among several classes of vertebrates. anatomically, the four have limb structure as their common ancestor. we might separate the mammals from the other three classes because they a) divergent; do not lay eggs b) identical; are warm-blooded c) varied; a four chambered heart d) homologous; have mammary glands

c.           is the correct answer