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

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Plantlife can be studied at a variety of levels, from the molecular, genetic and biochemical level through organelles, c..

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