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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..

Population Regulation in an Ecosystem
Population Regulation in an Ecosystem

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

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Chemical Composition of the Body

The body is comprised of different elements with hydrogen, oxygen, carbon, and nitrogen as the major four. This tutorial..

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Hormones are produced in the endocrine glands of animals. The pituitary gland and hypothalamus are the most impor..