Quiz 12_2008

Quiz 12_2008 - Quiz 12 1 North America used to have wooly...

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Quiz 12 1. North America used to have wooly mammoths, mastodons and saber-tooth cats. What happened to them? a. They went extinct when a meteorite struck 65 million years ago. b. They were overhunted about 12000 years ago by the first human colonists to North America. c. They were the victims of climate change. xd. probably b and c. e. probably a and c. 2. Why does clearcutting in the tropical rainforest cause more permanent damage than does clearcutting in Pennsylvania or Ohio? a. The thick topsoil in most of the US may contain dormant seeds that quickly sprout and slow erosion. b. Topsoil in the tropics is very thin, and without tree roots to hold it, it quickly erodes. c. Mycorrhizae may quickly die in the tropics after trees are removed if there are no nearby sources of seed to reforest a clearing. xd. all of the above. e. none of the above. 3. The specific properties of each biome are determined by combinations of a. temperature and seasonality.
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This note was uploaded on 03/23/2009 for the course BSCI 106 taught by Professor Porter during the Fall '08 term at Maryland.

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Quiz 12_2008 - Quiz 12 1 North America used to have wooly...

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