What are invertebrates?

 

            Invertebrates, or animals without backbones, make up 97 percent of all animals. This group of animals includes all the arthropods such as spiders, insects and crustaceans. The remaining invertebrates are mainly soft-bodied animals, although many of them have shells. They include animals such as sponges, corals, shellfish, worms, sea urchins and starfish and many less familiar animals.

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