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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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Cell respiration is the process of creating ATP. It is "respiration" because it utilizes oxygen. Know the different stag..

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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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Control of Growth & Development tutorials look at how the genetic makeup determines the biological processes on a da..

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This tutorial describes the sigmoid curve, annual plant growth, tree growth, human growth, and insect growth as the grow..