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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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Obtaining air outside an aquatic environment required species to acquire suitable adaptations, and this was the case of ..

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DNA is a double helix structure comprised of nucleotides. A nucleotide, in turn, is made up of phosphate molecule, deoxy..

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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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