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Bryophytes are a plant group characterized by being nonvascular. They include the mosses, the liverworts, and the hornwo..

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Neurons generate electric signals that they pass along to the other neurons or target tissues. In this tutorial, you wil..

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It only takes one biological cell to create an organism. A single cell is able to keep itself functional through its 'mi..

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Freshwater Lentic Communities & Animals

This tutorial looks at some of the communities in freshwater lentic habitats. For instance, symbiosis occurs in a commun..

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