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

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Planktons are microscopic organisms that live suspended in aquatic habitats. There are two groups: the phytoplanktons an..

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Regulation of Biological Systems

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