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Invertebrates. Animals without backbones. Review: Classification is the arrangement of organism into orderly groups based on similarities. Invertebrates. Animals without backbones make up 97 percent of all animal species. Sponges. Cnidarians (ni DER ee uh).
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Invertebrates Animals without backbones
Review: Classification is the arrangement of organism into orderly groups based on similarities.
Invertebrates Animals without backbones make up 97 percent of all animal species.