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This tutorial describes the different types and causes of brain damage. Find out how genetics, physical injury, lack of ..

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A balanced diet is essential to a healthy organism. Insufficiency or too much of a particular element or compound, such ..

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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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Origins of Life on Earth

Earth was created around 4.5 billion years ago and life began not long after. Primitive life likely possessed the elemen..

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This tutorial deals with the abiotic factors of the freshwater environment that determine what sort of life would be sui..