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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 ..

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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 living in aquatic habitats have diversified and evolved through time. They eventually occupy ecological niches a..

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This tutorial describes the different types and causes of brain damage. Find out how genetics, physical injury, lack of ..

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The evolution of the species of the genus "Homo" led to the emergence of modern humans. Find out more about human evolut..

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Ferns and their relatives are vascular plants, meaning they have xylem and phloem tissues. Because of the presence of va..