18. which theorist was generally optimistic about urban life? a. simmel b. wirth c. gans d. berger 19. across the world there is a general trend a. more people moving to rural areas b. more people living in cities c. people abandoning cities in favor of suburbs d. masses of people leaving suburbs for central cities

1. artillery

2. jose san martin

3.their economies remained dependent on outside powers.

4. drafted new economies

5. democracies have replaced dictatorships

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