One of the criteria used by the U.S. geological Survey and the Defenders of Wildlife in ranking endangered ecosystems in the United States is the number of present examples of a particular ecosystem or the total area.

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The U.S. Geological Survey and organizations like Defenders of Wildlife use various criteria to rank endangered ecosystems, including the number of current examples of a particular ecosystem or the total area it covers, to assess its rarity and conservation status.

One of the Criteria Used by the U