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la brea assign - factors may have affected the plant eaters...

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Steven Avery February 5, 2005 Bisc. 102 Page Museum Field Trip Extinct mammals, like the saber-toothed cats and mammoths, and birds, like Merriam's Teratorn and Grinnell's Eagle, roamed the Los Angeles Basin for several hundred thousand years. These and other extinct species were entrapped and their remains were preserved between 40,000 and 10,000 years ago at Rancho La Brea, during the last of four great Ice Ages at the end of the Pleistocene Epoch. There are two possible theories on why the large mammals found at Rancho La Brea went extinct. One is that at the close of the Ice age, the world climate underwent drastic changes. The factors involved in most places, were reduced rainfall and the yearly cycle of seasons became more extreme. These
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Unformatted text preview: factors may have affected the plant eaters directly by disrupting mating and migration, or indirectly by reducing the quantity and quality of plants on which they fed. The second theory involves kill sites that show that early man in North America had developed extensive weapons. This advanced culture allowed humans to become more effective in hunting these big plant eaters. Man’s hunting or other activities may also have been a factor in extinction. I feel that the true reason is a combination of both. I feel that both weapons and climate change resulted in the extinction. I don’t think that one factor could result in the extinction, and more must have caused it....
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