During which eon did oxygen begin to build up the most in Earth’s atmosphere?
A) Proterozoic
B) Archean
C) Hadean
D) Phanerozoic

During the seventeenth century a. the english monarchy was temporarily replaced by a new government called the commonwealth. b. the english enjoyed an unprecedented period of economic and political security. c. the english government was seized by the puritans, who instituted a strict oligarchy. d. the english united with spain and holland to battle france for supremacy in the new world.