Air pollution in US National Parks is effecting the environment in what way(s)? a. Plant damage from ozone exposure b. High levels of mercury found in endangered bat species c. Changes to alpine ecosystems

Air pollution in US National Parks is effecting the environment in what way(s)? a. Plant damage from ozone exposure b. High levels of mercury found in endangered bat species c. Changes to alpine ecosystems due to nitrogen d. All of the above Please select the best answer from the choices provided A B C D.

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