Topics: Demography, Population, Symbiosis Pages: 2 (675 words) Published: February 14, 2013
1. Parasitism - one organism, known as a parasite, lives in or on the other organism, known as the host, from which it derives nourishment. It is not in the best interest of the parasite to kill the host. 2. Deserts - receive less than 25 centimeters of rain per year; windy. 3. Tundra-permanent frozen layer-permafrost; found north of Taiga and in small patches on the mountain tops called alpine tundra. No trees can live here. During a brief 2 month summer, the top layer thaws, and many plants and lichens grow; averages 25cms of precipitation; however the permafrost layer/melting snow keep the soil moist. 4. Deciduous Forest-typically lose their leaves in the fall or winter. They grow their leaves back in the Spring. Typically found in the eastern USA, south central & Southeastern Canada, southern Africa, and many areas of Asia and Europe. They receive Approximately 100 cms of precipitation per year evenly distributed over the year. 5. Boreal Forest-Short cool summers, with long snowy winters. Soil freezes, receives 25 to 100 cms of precipitation. Consists of evergreen trees such as spruces & firs. The landscape is typically dotted with lakes, ponds and bogs. 6. Tropical Rain Forests-Located near the equator in Central and South America, Africa, Southeast Asia, and some islands; temperature is warm and relatively constant. Most areas receive in excess of 200 cms of rain per year. 7. Savannah-Grasslands spotted with trees or patches of trees; typically tropical with 50 to 150 cms of rain per year. 8. Rachel Carson-Wrote several articles for The New Yorker in 1960 which generated widespread discussion about pesticides. Wrote Silent Spring, which dramatized the potential danger of pesticides to food, wildlife, and humans. 9. Aldo Leopold-Wrote A Sand County Almanac. He worked in the Forest Service in the 1920’s. He worked towards the development of a wilderness policy and founded the field of game management. He said...
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