Animal Sciences. Per-Zoo by Allan B. Cobb PDF

By Allan B. Cobb

ISBN-10: 0028655605

ISBN-13: 9780028655604

This encyclopedia set, a part of the Macmillan technology Library sequence, is designed to house middle-school scholars via collage undergraduates. The paintings includes nearly three hundred signed entries on numerous subject matters on the subject of animal technological know-how, together with animal improvement, services, habit, ecology, and evolution.The connection among animals and people can also be explored in entries corresponding to Animal trying out, Apiculture, and family animals. additionally integrated are biographies of famous scientists who've made ''significant contributions'' to the sphere (for example,Henry Walter Bates, Rachel Carson, Gregor Mendel) in addition to introductions to profession possibilities within the similar disciplines. Articles seem in alphabetical order and diversity in size from numerous paragraphs to a number of pages. All are followed through see additionally references and extra interpreting feedback (including internet sites). each one quantity starts with an entire desk of contents, a geological time scale, 5- and six-kingdom type comparisons, a phylogenetic tree of existence, and a chart of measurements, abbreviations, and conversions. every one concludes with a subject outline,an index (volume four features a cumulative index), and a 600-plus-word word list.

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Autotrophs, also called primary producers, are generally photosynthetic organisms that use light energy to synthesize sugars and other organic compounds. Heterotrophs, or consumers, are supported by these photosynthetic organisms. The primary consumers are herbivores, who gain sustenance directly from autotrophs. Secondary consumers feed on the herbivores and tertiary consumers feed on the secondary ones. Those organisms that feed off of dead organisms are known as detritovores. An understanding of this pyramid within an ecosystem explains why the extent of photosynthetic activity determines the energy supply of the entire ecosystem.

Light pollution is not an inevitable consequence of making our streets and neighborhoods safer. Most light pollution comes from wasted light. At least 75 percent of the sky glow in most cities comes from poorly designed or improperly installed light fixtures. 5 billion per year is spent on wasted light that does nothing to improve security or safety. Efforts to Control Pollution Because pollution does not recognize national borders, the solution to many pollution problems requires cooperation at regional, national, and international levels.

Curiously, amphibians and reptiles of the Pleistocene did not suffer the extinctions that befell the mammals. Since these animals appear to be very sensitive to climate today, it was assumed they would be affected by changes in climate during the ice ages. Apparently they were not, and the fossils of these animals did not change over time either in species or abundance. Their geographic distribution may have changed as climates fluctuated, but there are very few known extinctions of species. Birds also managed to survive.

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Animal Sciences. Per-Zoo by Allan B. Cobb


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