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There are millions of different types of animals on Earth, ranging from simple animals, such as sponges and worms, to more complex animals. Students focus on complex animals, specifically the major vertebrate groups: fishes, amphibians, reptiles, birds, and mammals. Specific examples of vertebrates are shown to illustrate the different characteristics of complex animals. Important terminology includes: vertebrae, backbone, gills, ectoderm, fins, metamorphosis, eggs, scales, feathers, and endotherm.
