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This study guide tackles plant roots in greater detail. It delves into the development of plant roots, the root structur..

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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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Earth was created around 4.5 billion years ago and life began not long after. Primitive life likely possessed the elemen..

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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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Leaves are the major photosynthetic organ of a plant. Apart from that, they are also crucial to water movement. In this ..