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This tutorial noted some of the physical and chemical factors that provide the framework of a running water community in..

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Stems primarily provide plants structural support. This tutorial includes lectures on the external form of a woody twig ..

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Population Growth and Survivorship

This lesson looks at population attributes, regulation, and growth. It also covers population genetics, particularly gen..

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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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Plants protect themselves by releasing hydrogen peroxide to fight against fungal invasion. Another way is by secreting c..

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Fish

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