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For human species to obviate extinction, reproductive mature adults should be producing viable offspring in order to con..

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Humans are diploid creatures. This means that for every chromosome in the body, there is another one to match it. Howeve..

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

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Learn about community patterns and the ecological factors influencing these patterns. Revisit some of the ecosystems you..

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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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Plant organs are comprised of tissues working together for a common function. The different types of plant tissues are m..