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This tutorial recognizes the importance of food as a source of energy that will fuel many biological processes. A good d..

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Stems primarily provide plants structural support. This tutorial includes lectures on the external form of a woody twig ..

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Lentic or still water communities can vary greatly in appearance -- from a small temporary puddle to a large lake. The s..

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The sequence of amino acids determines the type of protein. Protein is synthesized according to the sequence of nucleoti..

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The Conscious & Unconscious Nervous System

This tutorial elaborates on how the nervous system works, particularly at the tissue level of the brain. There are three..

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The circulatory system is key to the transport of vital biomolecules and nutrients throughout the body. Learn about the ..

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