4th option: Stop the spread of communism to nations.
B, because cellular respiration needs oxygen for the first stage.<span />
Research by some scholars provides population estimates of the pre-contact Americas to be as high as 112 million in 1492, while others estimate the population to have been as low as eight million. In any case, the native population declined to less than six million by 1650.
I believe there is a book on the matter as well. Good luck. :)
Answer: Gold can cost different in different places.
Explanation: Depending on where you get the gold, it varies what it will cost. It can cost a certain amount in other countries is at specific to the vernacular region of where you are mining the minerals. So the bronze coin to wind the dynasty would probably be a unique gold.