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Earth was created around 4.5 billion years ago and life began not long after. Primitive life likely possessed the elemen..

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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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The body is comprised of different elements with hydrogen, oxygen, carbon, and nitrogen as the major four. This tutorial..

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