This exoskeleton is like a large shell. It protects them and gives them shape. Ants and lobsters have one thing in common - they have exoskeletons . But you are different than your friends. Maybe your hair is black and their hair is brown.
Arthropods have diferences, too.
An ant and a lobster are both arthropods. But they are different. Ants are in a different group from lobsters. They're both arthropods, but an ant is an insect . A lobster is a crustacean .