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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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Regulation of Biological Systems tutorials are focused on the modulation of biological systems from cell to population l..

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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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Population Regulation in an Ecosystem

With regard to the population size of a species and what factors may affect them, two factors have been defined. They ar..

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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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This tutorial looks at the relationship between organisms. It also explores how energy is passed on in the food chain an..