skin
Amphibians do not have outer covering.
exskeleton
NO
hair
The hard outer covering that protects the animals body can be a couple of things. It is most likely a shell.
i have know idea
we identify them by their outer covering, behaviour and their stances
The outer shell on animals is called an exoskeleton. This exoskeleton is there because these animals do not have a spine like humans do, so they must have the shell to protect them from harm.
yeah if they have skin they have to have a outer covering or they will die from getting sick
epithelial
it's a sea animal with a hard outer covering ex. crab, lobster, etc.