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

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The cell is defined as the fundamental, functional unit of life. Some organisms are comprised of only one cell whereas o..

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Independent Assortment and Crossing Over

This tutorial describes the independent assortment of chromosomes and crossing over as important events in meiosis. Read..

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Freshwater Communities & Lentic Waters

Lentic or still water communities can vary greatly in appearance -- from a small temporary puddle to a large lake. The s..

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

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A sensory system is a part of the nervous system consisting of sensory receptors that receive stimuli from the internal ..

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