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The sea was teeming with life. Eventually, through reproduction and continued variation, fish came about. There are over..

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Ferns and their relatives are vascular plants, meaning they have xylem and phloem tissues. Because of the presence of va..

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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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Human Neurology deals essentially with the nervous system of humans. It also features the various theories put forward b..

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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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Human intelligence provided the means to utilize abstract ideas and implement reasoning. This tutorial takes a further l..