Check?
Which of the following is a characteristic of vertebrates?
a hard exoskeleton made of chitin
a hard outer shell

Question

Check? 
Which of the following is a characteristic of vertebrates? 
       a hard exoskeleton made of chitin
       a hard outer shell <---
       stinging cells
       an inner skeleton made of bone or cartilage

anonymous · Answer

It is the last choice because we are vertebrates and do not have a hard exoskeleton, a hard outer shell or stinging cells, but we do have an inner skeleton.

dqswag · Answer

amniotic eggs *Cough Medal!! :D

anonymous · Answer

amniotic eggs is not a choice on the list

anonymous · Answer

@dqswag Amniotic eggs? Okay.... 
@KatieMTB Thanks!!

dqswag · Answer

Welcome