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University of Toronto Scarborough
Environmental Science
Carl Mitchell

Chapter 9 Species diversity: the number and the variety of species in the world or in a particular region Species richness: the number of species Evennessrelative abundance: numbers of individuals of different species are equal or skewed Taxonomists: scientists who classify species (use physical appearance and genetic makeup to determine) - Subspecies Genetic diversity: varieties in DNA present among individuals within species and populations - what enables a species to adapt to ecological change inbreeding depression when genetically similar parents mate and produce weak or defective offspring ecosystem diversity: numbervariety of ecosystems diversity of biotic community within specific area - species are not evenly distributed - some groups rise in species through adaptive radiation - or diversified because of a tendency to be separated by barriers that promote allopatric speciation - or accumulated species through time because of low rates of extinction - 1.7 million to 2.0 million species of plants, animals, and microorganisms - total number: 3 million to 100 million - many are ove
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