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Meet the colorful takahē, an extremely rare flightless bird. Find out more about its unique features and why they matte..

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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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This lesson explores the impact of biosecurity threats, and why they need to be identified and managed. Examples to incl..

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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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This tutorial recognizes the importance of food as a source of energy that will fuel many biological processes. A good d..