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This tutorial looks at some of the communities in freshwater lentic habitats. For instance, symbiosis occurs in a commun..

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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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The blood sugar level is regulated by two hormones. The mechanism behind this type of negative feedback control is descr..

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Ecology & Biodiversity: New Zealand Flora & Fauna

New Zealand is known for its unique biodiversity, caused by its remarkable geography and geologic history. Breaking away..

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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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The Evolutionary Development of Multicellular Organisms

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