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Molecules move within the cell or from one cell to another through different strategies. Transport may be in the form of..

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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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Hormones are produced in the endocrine glands of animals. The pituitary gland and hypothalamus are the most impor..

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Lotic communities have conditions that are rather harsh for typical plants. Thus, the diversity of plant species in loti..

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This tutorial noted some of the physical and chemical factors that provide the framework of a running water community in..