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Animals Without Backbones (Big Science Ideas)
Animals Without Backbones - Big Science Ideas Author:Bobbie Kalman This title is suitable for ages 6 to 10 years. Over 98 per cent of Earth's animals are invertebrates. Invertebrates do not have backbones or internal skeletons, but some have hard coverings. Insects, spiders, worms, snails, and most ocean animals are invertebrates.