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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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In this tutorial, the works of Carl Gustav Jung and Sigmund Freud are described. Both of them actively pursued the way h..

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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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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 Evolutionary Development of Multicellular Organisms

Multicellular organisms evolved. The first ones were likely in the form of sponges. Multicellularity led to the evolutio..

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