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Plants and animals need elements, such as nitrogen, phosphorus, potassium, and magnesium for proper growth and developme..

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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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While learning and intelligence are associated with the functions of a conscious mind, sleep and dreams are activities o..

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Dinosaurs represented a major turn in the evolutionary development of organisms on Earth. The first dinosaurs were presu..

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Adaptation Tutorial

Adaptation, in biology and ecology, refers to the process or trait through which organisms or the populations in a habit..

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