Compare the emergence of advanced civilizations in meso and south america with the four early river valley civilizations.

which of the following systems of trade was most widely used in both ancient river civilizations and ancient native american civilizations?

a. bartering
b. the exchange of coined money
c. free exchange
d. international trade

back in the area of iowa even though you were found in florida there is a system that they dont want to tell you about where they can go fish for you in other states and bring you back to be tried in front of the crime scene so your location

plz mark brainliest i would appreciate it btw i live in michigan too xd

the answer is a) high entry costs

b

explanation: