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

By Allan B. Cobb

This encyclopedia set, a part of the Macmillan technological know-how Library sequence, is designed to deal with middle-school scholars via university undergraduates. The paintings comprises nearly three hundred signed entries on quite a few subject matters with regards to animal technology, together with animal improvement, capabilities, habit, ecology, and evolution.The connection among animals and people is additionally explored in entries reminiscent of Animal checking 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 look in alphabetical order and diversity in size from numerous paragraphs to numerous pages. All are observed via see additionally references and extra analyzing feedback (including net sites). every one quantity starts off with an entire desk of contents, a geological time scale, 5- and six-kingdom category comparisons, a phylogenetic tree of existence, and a chart of measurements, abbreviations, and conversions. every one concludes with a subject matter outline,an index (volume four includes a cumulative index), and a 600-plus-word thesaurus.

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Synthetic organic chemicals. The water pollution problem causing the greatest concern is the ever-increasing variety of new chemical compounds. Often new compounds are developed and old ones abandoned before their environmental impact is known. Some of these compounds will remain in water for decades, or longer. The presence of these synthetic chemicals adversely affect fishes and other aquatic life. Many researchers think that some synthetic chemicals mimic natural hormones, disrupting growth and reproductive cycles in affected populations.

Platyhelminthes are unsegmented. They have muscles and a simple nervous system that includes a primitive brainlike structure which is formed from a thickening of the ventral nerve cords in the head region. They have a mouth, but no anus, and a primitive digestive cavity. They also have a primitive excretory system. They do not have a respiratory or circulatory system and are limited to simple diffusion for gas exchange. They can regenerate by fission as well as reproduce sexually, sometimes with complex life cycles passing through more than one host.

The burning of fossil fuels produced the most smoke, so some cities restricted the type of coal that could be burned to hard coal, which burns cleaner than soft coal. More efficient burners were installed and devices were attached to smokestacks to remove soot. Diesel locomotives replaced steam locomotives, which had burned coal or oil to heat the water to make the steam. These changes all led to a gradual reduction in smoke pollution during the last half of the twentieth century. However, a new type of air pollution, smog, became a problem beginning in the 1940s.

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