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In plants, growth occurs in meristems, which are the site of repeated cell division of unspecialized cells. These cells ..

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Meiosis is a form of cell division that creates gametes. It is comprised of two divisions that in the end, the resulting..

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The Earth's ecosphere was rapidly changing and throwing up a wide range of ecological niches that new adaptive organisms..

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The water cycle (also referred to as the hydrological cycle) is a system of continuous transfer of water from the air, s..

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The circulatory system is key to the transport of vital biomolecules and nutrients throughout the body. Learn about the ..