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Certain species are capable of expressing characteristics indicative of the state of the ecosystem they occupy. They are..

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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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Plant organs are comprised of tissues working together for a common function. The different types of plant tissues are m..

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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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Animals adapt to their environment in aspects of anatomy, physiology, and behavior. This tutorial will help you understa..