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

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Stems primarily provide plants structural support. This tutorial includes lectures on the external form of a woody twig ..

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Bryophytes are a plant group characterized by being nonvascular. They include the mosses, the liverworts, and the hornwo..

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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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Hormones are chemical messengers produced by specialized glands and they were produced by switching on the genes designe..