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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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This tutorial recognizes the importance of food as a source of energy that will fuel many biological processes. A good d..

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Animals adapt to their environment in aspects of anatomy, physiology, and behavior. This tutorial will help you understa..

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The kidneys are responsible for the regulation of water and inorganic ions. Read this tutorial to learn about the differ..

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The body is comprised of different elements with hydrogen, oxygen, carbon, and nitrogen as the major four. This tutorial..