72. Which environmental NGO helped U. S. citizens organize massive opposition to a proposed government policy that would have allowed sewer operators to routinely dump virtually untreated sewage into the nation’s lakes, rivers, and streams?

answer; ///i believe that it means; ///you pay no customs duty on the chocolates;

i believe

clean air is essential for health and survival

clean air provides nitrogen gas for plant respiration

clean air supplies oxygen that enables living organisms to breathe

hope this

i am brianly

sorry if this doesn't

isb

explanation:

ahw

semi-desert lowlands, hope this !