These are animals which mainly lack a skeletal system and other developed organs. This means most of them do not possess a rigid body structure and as a result, cannot grow very large.

These are animals that possess a well-defined internal skeleton or Endoskeleton, which includes a backbone.

To compensate for the lack of an internal skeleton, most invertebrates have an external skeleton or Exoskeleton that protects their soft, inner body.

It is  a tough substance that makes an exoskeleton that makes up for the lack of backbones in invertebrates.

sponges, segmented worms, Echinoderms, mollusks and anthopods are examples of  vertebrates

Vertebrates possess a well-defined internal skeleton or ___________________

Other characteristics of vertebrates include having a protective skin covering, have legs, wings, or fins for movement.

Give 5 examples of vertebrates.