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

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A balanced diet is essential to a healthy organism. Insufficiency or too much of a particular element or compound, such ..

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The Water Cycle

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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Nutrients in the soil are essential to the proper growth of a land plant. This tutorial deals with the properties of soi..

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