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Meet the colorful takahē, an extremely rare flightless bird. Find out more about its unique features and why they matte..

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The human respiratory system is an efficient system of inspiring and expiring respiratory gases. This tutorial provides ..

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Muscle cells are specialized to generate force and movement. Learn about the different types of muscle tissues in this t..

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This tutorial describes the different types and causes of brain damage. Find out how genetics, physical injury, lack of ..

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This tutorial noted some of the physical and chemical factors that provide the framework of a running water community in..

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