eon, era, period, epoch, Paleozoic, ancient life, Mesozoic, middle life, mammals, warm-blooded vertebrates distinguished by hair or fur, mammary glands for feeding young, and three middle ear bones, reptiles, vertebrates covered in special skin made up of scales, bony plates, or a combination of both., amphibians, animals that can live in both land and water, Devonian, first animal on land, Permian, conifer trees and and warm blooded reptiles, Triassic, First dinosaurs appear

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