Passage: "Urban parks are not merely aesthetic additions to a city; they function as vital ecosystems that improve air quality, reduce heat, and support local wildlife." What is the author's main argument?
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A
Urban parks should be redesigned to attract more visitors.
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B
Urban parks serve critical environmental purposes beyond their visual appeal.
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C
Cities should replace all unused land with green spaces.
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D
Wildlife populations are declining due to urban development.