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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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Human Neurology

Human Neurology deals essentially with the nervous system of humans. It also features the various theories put forward b..

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Passive and Active Types of Immunity

Lymphocytes are a type of white blood cell capable of producing a specific immune response to unique antigens. In thi..

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Illusions are the perceptions and sensory data obtained from situations in which human error prevents us from seeing the..

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Running Water Freshwater Communities

This tutorial introduces flowing water communities, which bring new and dithering factors into the equation for possible..

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Soils

Nutrients in the soil are essential to the proper growth of a land plant. This tutorial deals with the properties of soi..