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A healthy wetland also prevents pollutants from running into the bay. Ecologists call wetlands "the kidney" of the ecosystem because of the natural cleansing functions they perform. They do this by retaining sediments and toxic pollutants attached to the sediments. Wetland plants also reduce algae blooms and fish kills.

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- http://www.pinolecreek.org/index.php?option=com_content&view=article&id=53:chelsea-wetlands&catid=36:future-projects&Itemid=55

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Q: Why are wetlands the 'kidney' of nature?
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