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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..

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Neurons generate electric signals that they pass along to the other neurons or target tissues. In this tutorial, you wil..

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This tutorial investigates the genetic diversity in more detail. It also delineates how certain alleles are favored over..

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Hormones are chemical messengers produced by specialized glands and they were produced by switching on the genes designe..

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Evolution of Life – Ancient Earth

Autotrophs flourished, absorbing carbon and light. Soon after, primitive life forms that could assimilate oxygen thrived..