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This tutorial deals with the abiotic factors of the freshwater environment that determine what sort of life would be sui..

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Plants and animals need elements, such as nitrogen, phosphorus, potassium, and magnesium for proper growth and developme..

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

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