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The water cycle (also referred to as the hydrological cycle) is a system of continuous transfer of water from the air, s..

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The evolution of the species of the genus "Homo" led to the emergence of modern humans. Find out more about human evolut..

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Human consciousness and behavior are an interesting topic since they are determined and controlled by the brain. Conscio..

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

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Humans are capable of only one mode of reproduction, i.e. sexual reproduction. Haploid sex cells (gametes) are produced ..

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