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

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Freshwater ecology focuses on the relations of aquatic organisms to their freshwater habitats. There are two forms of co..

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This tutorial elaborates on how the nervous system works, particularly at the tissue level of the brain. There are three..

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This tutorial elaborates on the physical development of humans, particularly from puberty to adulthood. Read this tutori..