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Mammals lived at same time as dinosaurs; mammals spread out when dinosaurs became extinct

RAT LATIN meaning KINGDOM _____________ PHYLUM ____________________________ SUBPHYLUM ___________________________ CLASS _______________________________ ORDER _____________________________ ANIMALIA CHORDATA VERTEBRATA “backbone” Mammalia “breast” RODENTIA “to gnaw”

VIBRISSAE EXTERNAL NARES PINNA

MAMMARY GLANDS

EXIT OPENINGS

DIAPHRAGM Divides coelom into: THORACIC CAVITY heart & lungs ABDOMINAL CAVITY digestive, excretory, reproductive organs

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TRACHEA BRONCHI LUNGS Cartilage rings Left lung smaller makes room for heart

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HEART

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KIDNEYS