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

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Bryophytes (nonvascular plants) are a plant group characterized by lacking vascular tissues. They include the mosses, th..

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The nervous system is essentially a biological information highway. This tutorial gives an overview of the nervous syste..