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A food chain is somewhat a linear sequence of links in a food web starting from a trophic species that eats no other species in the web and ends at a trophic species that is eaten by no other species in the web. A food chain differs from a food web, because the complex polyphagous network of feeding relations are aggregated into trophic species and the chain only follows linear monophagous pathways. A common metric used to quantify food web trophic structure is food chain length. In its simplest form, the length of a chain is the number of links between a trophic consumer and the base of the web and the mean chain length of an entire web is the arithmetic average of the lengths of all chains in a food web.
Food chains were first introduced in a book published in 1927 by Charles Elton, which also introduced the food web concept.
Food chains are directional paths of trophic energy or, equivalently, sequences of links that start with basal species, such as producers or fine organic matter, and end with consumer organisms.
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http://en.wikipedia.org/wiki/Food_chain
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William Sanford "Bill" Nye (born November 27, 1955), popularly known as Bill Nye the Science Guy, is an American science educator, comedian, television host, actor, mechanical engineer, and scientist. He is best known as the host of the Disney/PBS children's science show Bill Nye the Science Guy (1993–1998) and for his many subsequent appearances in popular media as a science educator.
William Sanford Nye was born in Washington, D.C., the son of Jacqueline (née Jenkins; c. 1920–2000), a codebreaker during World War II, and Edwin Darby "Ned" Nye (died 1997), also a World War II veteran whose experience in a Japanese prisoner of war camp led him to become a sundial enthusiast. Nye is a fourth-generation Washington, D.C. resident on his father's side of the family. After attending Lafayette Elementary and Alice Deal Junior High in the city, he was accepted to the private Sidwell Friends School on a partial scholarship, graduating in 1973. He studied mechanical engineering at Cornell University, where one of his professors was Carl Sagan, and graduated with a Bachelor of Science in 1977. He was awarded an honorary doctorate by The Johns Hopkins University in May 2008. In May 2011, Nye was awarded an Honorary Doctor of Science degree from Willamette University where he was the keynote speaker for that year's commencement exercises.
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http://en.wikipedia.org/wiki/Bill_Nye
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This article is licensed under the Creative Commons Attribution-ShareAlike 3.0 Unported License, which means that you can copy and modify it as long as the entire work (including additions) remains under this license.
George Joshua Richard Monbiot (born 27 January 1963) is an English writer, known for his environmental and political activism. He lives in Machynlleth, Wales, writes a weekly column for The Guardian, and is the author of a number of books, including Captive State: The Corporate Takeover of Britain (2000) and Bring on the Apocalypse: Six Arguments for Global Justice (2008). He is the founder of The Land is Ours campaign, which campaigns peacefully for the right of access to the countryside and its resources in the United Kingdom. In January 2010, Monbiot founded the ArrestBlair.org website which offers a reward to people attempting a peaceful citizen’s arrest of former British prime minister Tony Blair for alleged crimes against peace.
George Monbiot grew up in Henley-on-Thames in South Oxfordshire, England, in a house next to Peppard Common. Politics was at the heart of family life—his father, Raymond Geoffrey Monbiot, is a businessman who headed the Conservative Party's trade and industry forum, while his mother, Rosalie—the elder daughter of Conservative MP Roger Gresham Cooke—was a Conservative councillor who led South Oxford district council for a decade. His uncle, Canon Hereward Cooke, was the Liberal Democrat deputy leader of Norwich City Council between 2002 and 2006. Monbiot was educated at Stowe School in Buckinghamshire, an independent school, and won an Open Scholarship to Brasenose College, Oxford.
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http://en.wikipedia.org/wiki/George_Monbiot
This article is licensed under the Creative Commons Attribution-ShareAlike 3.0 Unported License, which means that you can copy and modify it as long as the entire work (including additions) remains under this license.
This article is licensed under the Creative Commons Attribution-ShareAlike 3.0 Unported License, which means that you can copy and modify it as long as the entire work (including additions) remains under this license.