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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 hominid family diversified from the apes around 6 to 8 million years ago. Since then, the evolutionary path has prov..

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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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The human respiratory system is an efficient system of inspiring and expiring respiratory gases. This tutorial provides ..

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This tutorial recognizes the importance of food as a source of energy that will fuel many biological processes. A good d..

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