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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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This tutorial looks at the relationship between organisms. It also explores how energy is passed on in the food chain an..

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Lentic or still water communities can vary greatly in appearance -- from a small temporary puddle to a large lake. The s..

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The gastrointestinal system breaks down particles of ingested food into molecular forms by enzymes through digestion and..

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Muscle cells are specialized to generate force and movement. Learn about the different types of muscle tissues in this t..

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