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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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The cell is defined as the fundamental, functional unit of life. Some organisms are comprised of only one cell whereas o..

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Freshwater ecosystem is comprised of four major constituents, namely elements and compounds, plants, consumers, and deco..

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The human respiratory system is an efficient system of inspiring and expiring respiratory gases. This tutorial provides ..

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The hominid family diversified from the apes around 6 to 8 million years ago. Since then, the evolutionary path has prov..