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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..

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

Illusions are the perceptions and sensory data obtained from situations in which human error prevents us from seeing the..

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

DNA is a double helix structure comprised of nucleotides. A nucleotide, in turn, is made up of phosphate molecule, deoxy..

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

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