The arthropods are invertebrates that means that they don’t have a vertebral column to support their body that is why they have an exoskeleton which gives support to their body. The exoskeleton provides support for tissues and organs and protects the organism from predators.
Yes.
Why does a crab she'll help it survive in his habitat
a shell
yes
Lobsters and crabs
Crabs, lobsters, beetles, ants.
chitin
No, crabs have an exoskeleton so they do not need a backbone.
No. Crabs do not have an internal skeleton (endoskeleton). They have only an external skeleton (exoskeleton) that does not have any ribs.
Hermit crabs are considered to be in the arthropods family. Hermit crabs have a hard exoskeleton made of chiton which helps provide protection and give the muscles attachment support. Although a hermit crab will grow, their exoskeleton does not so they must constantly shed said exoskeleton in favor for a new one that it grows into.
The crab's exoskeleton helps and supports its body. It protects the soft body of the crab. It is also waterproof, so it will protect it underwater, too.
Exoskeleton means "outside skeleton". Animals that have no bones, but a hard outer shell have an exoskeleton- like crabs and lobsters. That would be a weird looking parrot.