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This tutorial looks at sex determination via the sex chromosomes, X and Y. Read it to get more info on X and Y chromosom..

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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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This tutorial looks at some of the communities in freshwater lentic habitats. For instance, symbiosis occurs in a commun..

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This tutorial deals with the structure and function of flowers, fruits, and seeds. Also included here are the types of f..