Which of the following does not have an exoskeleton?

the tortoise does not have a true exoskeleton it has a shell, but it still has an internal endoskeleton like all other reptiles.

Alfredo412, the shell is the exoskeleton formed from the vertebrae

great info!!

I hardly ever get access to the helps at the bottom of the screen why not ?

SilverLynxCat, good point

good question!