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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