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Animals living in aquatic habitats have diversified and evolved through time. They eventually occupy ecological niches a..

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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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With regard to the population size of a species and what factors may affect them, two factors have been defined. They ar..

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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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While learning and intelligence are associated with the functions of a conscious mind, sleep and dreams are activities o..