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Different pregnancy and birth control and contraception strategies are described. Read this tutorial to learn each of th..

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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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Bryophytes (nonvascular plants) are a plant group characterized by lacking vascular tissues. They include the mosses, th..

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The cell is defined as the fundamental, functional unit of life. Some organisms are comprised of only one cell whereas o..

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This tutorial introduces flowing water communities, which bring new and dithering factors into the equation for possible..