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ANIMAL KINGDOM, Vertebrates (backbone), Invertebrates (no backbone), Jointed legs, No legs, Ectothermic (changing, body temperature), Endothermic (constant, body temperature), Arthropods, • Body, segmented, • Many, jointed limbs, . External, skeleton, e.g. crab,, flies, Shell, No shell, Lungs, Gills, Feathers, Hair or fur, Molluscs, Soft bodied, . Often, covered, with a shell, •Head with, eyes and/or, tentacles, e.g. snail, Echinoderms, • Hard spiny, skin, 5 to 10, arms,, Sucker feet, e.g. starfish, Worms, • Smooth tube-like, body with or, without segments, e.g. earthworm, Poriferans, Body perforated, by small pores, • Usually fixed in, 1 spot, e.g. sponge, Cnidarians, • Hollow body with, 1 opening (mouth), • Tentacles with, stinging cells, eg. jellyfish, coral, Reptiles, Scaly skin, Lay eggs, Most have, 4 legs, e.g. izards,, snakes, Amphibians, • Moist skin, Lay eggs in, water, • Most have, 4 legs, e.g. frogs, Fish, Scaly skin, • Most lay, eggs in, water, some, give birth to, ive fish, Have fins, e.g. goldfish, Birds, Lungs, .Feathers, and wings, • Eggs with, brittle shell, e.g. duck, Mammals, • Lungs, • Suckle, young with, milk from, mammary, glands, Monotremes, • Lay eggs, with, leathery, shells, Young lick, milk from, mother's fur, eg. platypus, Marsupials, • Give birth to, underdev-, eloped young, that grow in, a pouch, attached to, the mother's, nipples, e.g., kangaroo, Placentals, Young are, born tully, developed, • Placenta, provides, nourishment, and axygen, e.g. human, Figure 6.6.1 Classification of animals