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Mammals

Mammals. Evolution: from reptiles (a branch called therapsids ) ~ 150 mya. What event (65 mya ) provided mammals a “window of opportunity”?. Common Features of Mammals: 1. Complex Brain – allows complex behavior, learning, curiosity. 2. Well Developed Heart – Four Chambered Heart

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Mammals

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  1. Mammals

  2. Evolution: from reptiles (a branch called therapsids) ~ 150 mya What event (65 mya) provided mammals a “window of opportunity”?

  3. Common Features of Mammals: 1. Complex Brain – allows complex behavior, learning, curiosity.

  4. 2. Well Developed Heart – Four Chambered Heart Warm Blooded (Endothermy)

  5. 3. Well Developed Lungs – Air intake aided by what muscle?

  6. 4. Skin Glands Mammary Glands – milk (lactose)

  7. b. Sweat Glands Regulate body temperature & get rid of wastes Humans – all over Dogs & Cats - paws

  8. C. Sebaceous (Oil) Glands Lubricate hair & skin

  9. d. Scent Glands communication

  10. 5. Hair traps air therefore insulates This is a distinctly mammalian trait. Hair may also function for camouflage or signaling. Aquatic mammals have lost most of their hair (replaced with blubber)

  11. 6. Diphyodont Teeth Two sets: Baby teeth & Adult teeth (humans 20, 32)

  12. The two traits that make you a mammal?

  13. The two traits that make you a mammal?

  14. Monotremes Oviparous – lay eggs

  15. Marsupials Ovoviviparous – young develop inside mom (attached to yolk sac) Short gestation Further development in pouch (nipples-milk)

  16. Examples of Marsupials:

  17. Placental Mammals 95% of all mammals Internal development (viviparous) Longer gestation Fetus-umbilical cord-placenta-uterine wall

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