Classification of Animals — BIOLOGY STD 7 — Question

The exoskeleton is a tough outer covering of an animal body. e.g. Crab, lobster have exoskeletons.
Exoskeleton

1. It is a rigid external covering of the body that provides support and protection to the body.
2. It is present in invertebrates.
3. Examples: Crab, lobster, spiders, scorpions, etc.
4. It is in the form of a shell, or scales or feathers, etc.

Backbone

1. It is an internal skeleton (endoskeleton) that provides support and protection to the body.
2. It is a present invertebrate.
3. Examples: Humans, fish lions, dogs, etc.
4. It is made up of a number of vertebral joined to form a vertebral column.