In the United States, the groups of organisms with the highest proportion of endangered or extinct species live in

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Freshwater habitats have the highest proportion of endangered or extinct species in the United States. This includes fish, amphibians, and other aquatic organisms that are threatened by pollution, habitat destruction, and overfishing. The loss of healthy freshwater ecosystems also has negative impacts on human communities that depend on them for drinking water, agriculture, and recreation.

In the United States, the Groups of Organisms with the Highest