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The human respiratory system is an efficient system of inspiring and expiring respiratory gases. This tutorial provides ..

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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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The water cycle (also referred to as the hydrological cycle) is a system of continuous transfer of water from the air, s..

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The Evolutionary Development of Multicellular Organisms

Multicellular organisms evolved. The first ones were likely in the form of sponges. Multicellularity led to the evolutio..

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Adaptation Tutorial

Adaptation, in biology and ecology, refers to the process or trait through which organisms or the populations in a habit..

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Early Mammals on Earth

The Earth's ecosphere was rapidly changing and throwing up a wide range of ecological niches that new adaptive organisms..

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