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Certain species are capable of expressing characteristics indicative of the state of the ecosystem they occupy. They are..

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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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Different pregnancy and birth control and contraception strategies are described. Read this tutorial to learn each of th..

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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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The human respiratory system is an efficient system of inspiring and expiring respiratory gases. This tutorial provides ..