摘要: Ranging in size from a shrew to the blue whale, mammals are found air, on and under ground, oceans, rivers, lakes of world. A total 151 families divided into 1226 genera represent 5416 species. The mammalian middle ear is key diagnostic character has evolved three small bones jaw primitive vertebrates. Mammals regulate their internal temperature (endothermy). Diagnostic features include: sweat glands, hair, complex lung structure, mammary glands: production milk feed nurture young shared feature all mammals.
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