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

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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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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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Part of the genetic information is devoted to the synthesis of proteins. mRNA, a type of RNA, is produced as a transcri..

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Animals adapt to their environment in aspects of anatomy, physiology, and behavior. This tutorial will help you understa..