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Origins of Life on Earth
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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 looks at sex determination via the sex chromosomes, X and Y. Read it to get more info on X and Y chromosom..

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Illusions are the perceptions and sensory data obtained from situations in which human error prevents us from seeing the..

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