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Obtaining air outside an aquatic environment required species to acquire suitable adaptations, and this was the case of ..

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The circulatory system is key to the transport of vital biomolecules and nutrients throughout the body. Learn about the ..

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Life, as we know it today, is presumed to have started in the sea and many of them were likely eukaryotic animal-like or..

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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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ATP is the energy source that is typically used by an organism in its daily activities. The name is based on its structu..

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This tutorial elucidates body temperature regulation. Know the details here to learn how the body sets the body temperat..

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