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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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Different pregnancy and birth control and contraception strategies are described. Read this tutorial to learn each of th..

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Human intelligence provided the means to utilize abstract ideas and implement reasoning. This tutorial takes a further l..

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A sensory system is a part of the nervous system consisting of sensory receptors that receive stimuli from the internal ..

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Hormones are essential in the regulation of the activity of the various biological systems of the human body. The ineffi..