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Organisms employ different strategies to boost its defenses against antigens. Humans have an immune system to combat pat..

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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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Physical Development in Humans

This tutorial elaborates on the physical development of humans, particularly from puberty to adulthood. Read this tutori..

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Lentic or still water communities can vary greatly in appearance -- from a small temporary puddle to a large lake. The s..

Evolution of Life - Ancient Earth
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Autotrophs flourished, absorbing carbon and light. Soon after, primitive life forms that could assimilate oxygen thrived..

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Plant Water Regulation

Plants need to regulate water in order to stay upright and structurally stable. Find out the different evolutionary adap..