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

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For human species to obviate extinction, reproductive mature adults should be producing viable offspring in order to con..

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

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Indicator Species and Endangered Species

Certain species are capable of expressing characteristics indicative of the state of the ecosystem they occupy. They are..

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Osmoregulation is the regulation of water concentrations in the bloodstream, effectively controlling the amount of water..