Animals Without Backbones
All these are invertebrates. An invertebrate is an animal that doesn't have a backbone. Of all the millions of animals in the world, only about 45.000 different kinds, or species, have backbones. By far the greatest group are the invertebrates. Scientists have already given names to more than one million different species.rnInvertebrate animals include sponges, corals and jellyfish: worms, starfish and sea urchins; molluscs such as snails and octopuses; and arthropods such as insects, spiders and crabs.
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