PSYCH 1X03 : Chapter 09- From Tree Shrew to Ape.pdf
24 Jan 2014
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Document Summary
During permian and early triassic periods, much of the world"s fauna was dominated by therapsids, a diverse group of reptiles. At end of triassic, most therapsid groups disappeared, and dinosaurs radiated most lands. At end of mesozoic, placental and marsupial mammals dominated. Modern humans have many complex adaptations, like grasping hands, bipedal locomotion (walking upright on two legs), tool-making, language, and cooperation. About 200 mya, all the land that exists today was once a giant landmass called pangaea. About 125 mya, pangaea broke off into a northern half, called laurasia (north america and eurasia minus india), and a southern half, called gondwanaland. Much of our knowledge of history of life comes from study of fossils, the mineralized bones of dead organisms. Used to date age of volcanic rocks found in association with fossil material. Molten rock emerges from volcano at high temperatures. All of argon gas is boiled out of rock.
