[PSY 311] - Final Exam Guide - Ultimate 25 pages long Study Guide!

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First vertebrates ~ 500 myo- chordates and fishes-anamniotes. Amniotes- 2 different lineages synapsida and diapsida- differentiated by skull structure. Ancestors of all reptiles including birds and reptiles. Synapsides- pelycosaurs- fused arch: therapsids- humans ancestors- cynodonts- mammals. Hadrcodium- mammals don"t have the opportunity to diversify because of dinosaurs; first mammals- big brain for body size. Similar to platapy lay eggs and create milk. Northarctus- early primate 50 myo- ancient primates. Tree shrew- closest thing to what the earliest primates look like. Differences between primates and others is how they interact with the world. Paws with claws/ hands with nails dogs unable grasp primates have grasping hands and sometimes grasping feet are able to wrap their hands and hold something beneficial for eating. Some mammals have evolved grasping hands but it does not make them primates; i. e. raccoons, hamsters, prairie dogs. Humans have a much more grasping thumb than other primates.

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