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By Allan B. Cobb

ISBN-10: 0028655605

ISBN-13: 9780028655604

This encyclopedia set, a part of the Macmillan technological know-how Library sequence, is designed to deal with middle-school scholars via collage undergraduates. The paintings comprises nearly three hundred signed entries on numerous subject matters on the subject of animal technological know-how, together with animal improvement, features, habit, ecology, and evolution.The connection among animals and people can be explored in entries reminiscent of Animal trying out, Apiculture, and household animals. additionally incorporated are biographies of famous scientists who've made ''significant contributions'' to the sector (for example,Henry Walter Bates, Rachel Carson, Gregor Mendel) in addition to introductions to profession possibilities within the comparable disciplines. Articles seem in alphabetical order and variety in size from a number of paragraphs to numerous pages. All are observed by means of see additionally references and extra examining feedback (including net sites). every one quantity starts off with a whole desk of contents, a geological time scale, 5- and six-kingdom class comparisons, a phylogenetic tree of lifestyles, and a chart of measurements, abbreviations, and conversions. every one concludes with a subject matter outline,an index (volume four features a cumulative index), and a 600-plus-word word list.

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Marsupials (mammals with no placenta but with a pouch in which their young develop), sloths, and other animals such as glyptodonts, which looked like an armadillo, headed north. The proboscideans—including a group called the gomphotheres, with elongated lower jaws that looked like shovels—as well as mammoths, and mastodons, moved south. Relatives of modern horses, lions, camels, and wolves migrated after the gomphotheres. placenta a structure through which a fetus obtains nutrients and oxygen from its mother while in the uterus The Bering land bridge that connects Russia and Alaska supported the invasion from Asia of animals such as the mammoth, deer and their relatives, and bison to the Americas.

Biological Science, 6th ed. New York: W. W. , 1996. 29 Populations Krebs, Charles J. Ecology: The Experimental Analysis of Distribution and Abundance. New York: Harper Collins College Publishers, 1994. , Jr. Population Dynamics: Alternative Models. New York: Academic Press, 1979. Pianka, Eric R. Evolutionary Ecology. New York: Addison Wesley Longman, 2000. , and Gary L. Miller. 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.

In r-selected species, there tend to be dramatic fluctuations, including periods of exponential growth followed by population crashes. These species are particularly suited to taking advantage of brief periods of great resource abundance, and are specialized for rapid growth and reproduction along with good capabilities for dispersing. life history strategies methods used to overcome pressures for foraging and breeding In k-selected species, population density is more stable, often because these species occupy fairly stable habitats.

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