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By Allan B. Cobb

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Ecology, 4th ed. New York: W. H. Freeman, 2000. Soloman, Maurice E. Population Dynamics. London: Edward Arnold, 1969. Populations The study of populations and population ecology is a growing field of biology. Plants and animals are studied both singly and in relationship to one another. Factors that affect population growth and overall health are constantly being sought and analyzed. polyploid having three or more sets of chromosomes Animal populations are a bit easier to discuss since the genetic basis from which animal populations arise is not as complicated as the genetic basis of plants.

Domestic sewage is the largest and most widespread source of organic waste. Industrial organic waste tends to occur in larger quantities at fewer locations. Industries that make food and paper (and wood pulp) produce the largest amounts of industrial organic waste. aquatic living in water Bacteria can efficiently break down organic waste. However, bacterial action also removes oxygen from the water. Because fishes and other forms of aquatic life depend on dissolved oxygen, the bacterial action necessary to break down the waste damages the aquatic environment.

New York: Holt, 1993. Bowler, Peter J. Norton History of Environmental Sciences. New York: Norton, 1993. Caplan, Ruth. Our Earth, Ourselves: The Action-Oriented Guide to Help You Protect and Preserve Our Planet. Toronto, Canada: Bantam, 1990. Carson, Rachel. Silent Spring. Boston: Houghton Mifflin, 1994. Chiras, Daniel D. Environmental Science: Action for a Sustainable Future, 4th ed. Menlo Park, CA: Benjamin-Cummings Publishing Company, 1993. , and David Brownstone. The Green Encyclopedia. New York: Prentice Hall General Reference, 1992.

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