Answer:
I need help with this also! IM BRAINLY PLUS SOMEBODY PLEASE COME HELP ME!!!
Explanation:
Well there could be problems with food, and if there is a sickness, or a desater, like flooding around you could not move on. Also the population can reduce food, and water.
Tigris-Euphrates and Nile River valleys,
Indus valley, and later in China's Huang River Valley
Well, it is virtually impossible to count how much money there is on earth, and your question does not clarify whether you are looking for how much virtual money exists or physical, so I'll choose the latter.
There is approximately 1.11 Trillion US Dollars in physical form that is in circulation.