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

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Presentation transcript:

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 Warm Blooded (Endothermy)

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

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

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

C. Sebaceous (Oil) Glands Lubricate hair & skin

d. Scent Glands communication

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)

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

The two traits that make you a mammal?

Monotremes Oviparous – lay eggs

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

Examples of Marsupials:

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