well they have a backbone and no exoskeleton
No
No, cockroaches, like all insects, are invertebrates and have an exoskeleton.
They don't have a backbone. They have an exoskeleton.
No, it has an exoskeleton.
A tiger shark has a backbone
No. A good example is humans; Humans certainly do have a backbone, but no exoskeleton (well, I don't, anyway).
They have an exoskeleton, which is their "backbone"
Invertebraes: jellyfish,sponges,squid
No bones at all, backbone or otherwise. They have an exoskeleton (shell)
Insects do not have a backbone, they have an exoskeleton. Most insects have wings. Therefore insects have no backbone, but they do have wings.
the difference is in the backbone... if the backbone is unsaturated then it is an unsaturated polyester, if the backbone is saturated then it is a saturated polyester...