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Characterization of mammals

How mammals are characterized according to illustrations of representing beings, fundamental morphology, respiration, skin, circulation, thermal control, nitrogen waste, and kinds of reproduction?

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Illustrations of representing beings: dogs, horses, cats, giraffes, elephants, apes, whales, humans, bats, dolphins, kangaroos, opossums and platypus. Fundamental morphology: hair, mammary glands, diaphragm muscle, and enucleated red blood cells. Skin: impermeable and hairy. Respiration: pulmonary. Circulation: complete and closed, heart with four chambers. Nitrogen waste: urea. Thermal control: homeothermic. Kinds of reproduction: internal fecundation, sexual, oviparous monotremes (or prototherians), marsupials (or metatherians) and placental (or eutherians).

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