Which animals no have backbone?

Animals without backbones are called invertebrates. This is a huge group that includes:

* Arthropods: Insects, spiders, crustaceans, and more. They have a hard exoskeleton.

* Mollusks: Snails, slugs, clams, octopuses, and squid. They often have a shell.

* Worms: Earthworms, flatworms, roundworms, and many more. They have soft, elongated bodies.

* Echinoderms: Starfish, sea urchins, and sea cucumbers. They have a spiny skin.

* Cnidarians: Jellyfish, corals, and sea anemones. They have tentacles with stinging cells.

* Sponges: Simple animals that filter feed.

* Other invertebrates: There are many other groups of invertebrates, including rotifers, tardigrades, and bryozoans.

So, instead of saying "animals no have backbone," you can say "invertebrates."