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The sea was teeming with life. Eventually, through reproduction and continued variation, fish came about. There are over..

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If the balance of nature is left untouched, landscapes can change dramatically over time. A previous ecosystem is supers..

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Human intelligence provided the means to utilize abstract ideas and implement reasoning. This tutorial takes a further l..

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This tutorial deals with the structure and function of flowers, fruits, and seeds. Also included here are the types of f..

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Obtaining air outside an aquatic environment required species to acquire suitable adaptations, and this was the case of ..