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Mammals

Mammals. Have hair Ability to nourish their young with milk Breathe air 4-chambered heart Endotherms. Environment Live in a wide variety of ecosystems Land, water, and flying mammals. Food Source Must eat 10 times as much food as a reptile to maintain body heat

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Mammals

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  1. Mammals Have hair Ability to nourish their young with milk Breathe air 4-chambered heart Endotherms

  2. Environment • Live in a wide variety of ecosystems • Land, water, and flying mammals • Food Source • Must eat 10 times as much food as a reptile to maintain body heat • Use jaws and teeth to eat (Specialized teeth) • Digestive tract absorbs nutrients for the body to use

  3. Maintaining Homeostasis - Internal (Circulation, Respiration, Excretion) • lungs to breathe • Have a diaphragm- powerful muscle • 2 separate loops in circulatory system and a 4-chamber heart • Kidneys help maintain homeostasis by filtering urea from the blood as well as by excreting excess water or retaining needed water Maintaining Homeostasis - External (Response) • Highest developed brain • Cerebral cortex- center of thinking and other complex behaviors • Highly developed senses to detect and respond to stimuli from their external environment

  4. Movement • Backbone that flexes both vertically and side to side. • Very flexible • Move in a variety of ways depending on their lifestyle Reproduction • Internal fertilization • Feed on mother’s milk • Most care for their young • Duration of care varies among species • Evolutionary Milestone • Endotherm, Hair, mammary glands, breathe air, 3 middle-ear bones

  5. Picture on page 827, Fig 32-7 – homologous structures • Vocabulary: mammary gland (821), cerebral cortex (825) Picture and Vocabulary

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