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Dinosaurs represented a major turn in the evolutionary development of organisms on Earth. The first dinosaurs were presu..

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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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The sequence of amino acids determines the type of protein. Protein is synthesized according to the sequence of nucleoti..

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

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A Balanced Vitamin Diet – Vitamins A – K

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