ow Humans Evolved Ch. 10-14

ow Humans Evolved Ch. 10-14 - The evolution of humans...

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Unformatted text preview: The evolution of humans Readings Readings for this unit are from How Humans Evolved (HHE) 1 Primates * pp. 251267 Humans are primates , an order characterized by Grasping hands and feet Nails and fingertips Highly developed stereroscopic vision * Eyes are close together, face forward, and are used together Lots of detailed stuff Traits Freeman Fig 34.40 What sort of traits to biologists use to characterize a group? How would you interpret the fact that humans dont have grasping feet? The angiosperm explosion Flowering plants diversified very rapidly around 100 mya million years ago This radically changed the ecology of the world, and opened up many new niches, apparently including space for primates 1 Primate adaptations There are a variety of theories for how characteristic primate adapta- tions evolved Each step was likely favored adaptively Likely something to do with processing and handling angiosperm fruit and flowers Or else the insects that fed on these fruit and flowers Getting fed A major factor in adaptation is food source. The most important strategies for early primates were: Frugivory : eating fruits (and sometimes flowers) Folivory : eating leaves Insectivory : eating insects See HHE Fig. 10.14 for how scientists use teeth to learn about organ- isms Anthropoids Anthropoids is the sub-group of primates including apes and monkeys Hominoids Hominoids are the great apes (including people) Apes are more adapted for swinging through trees, whereas monkeys are more adapted for climbing and leaping Apes radiated into many habitats before monkeys did Many ape species were apparently later replaced by monkeys 2 Patterns of replacement Why might apes have diversified, and later been replaced by monkeys?...
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ow Humans Evolved Ch. 10-14 - The evolution of humans...

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