Invertebrates are simply "animals without backbones". Our definition of invertebrates includes all hetertrophic, spine-free organisms with a eukaryotic cell structure. Invertebrates compose over 99% of animal species on Earth, and can be singlecelled, colonial, or multicelled, microscopic or enormous, occupying just about every niche on the planet. See Morphology to learn more Invertebrate basics.
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