plants, Most living things can be sorted into ______ and animals., invertebrates, Animals are usually split into two groups. Vertebrates (with a backbone) and ___________ (without a backbone)., backbone, Vertebrates are animals with a ___________ ., birds, Vertebrates can be separated into five broad groups. Mammals, fish, reptiles, ______ and amphibians., milk, A liquid that mammal mothers use to feed their babies., feathers, Birds have a beak, wings, 2 legs and ________ covering their bodies., amphibian, These vertebrates live on land and in water., variation, The differences between living things is sometimes called __________., sky, There are millions of species of animals living in the world, living on the land, in the _____ and in the sea., gills, Fish have fins instead of legs and ______ instead of lungs.

Classifying Vertebrates

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