Answer:
Battle of Stalingrad-1942
Answer:
Primary and Secondary sectors
Explanation:
Primary is the extraction of natural materials like mining, fishing, or agriculture.
Secondary is the manufacturing sector like producing man-made goods, or utilities.
Bartering, which has taken place since the early history of man, implies a process of exchanging of goods. Bartering may present some difficulties during the process of exchanging. One problem that may occur when one is bartering, appears as the result of two people having different ideas about the value of the item (Option "B"). Since bartering lacks a standard unit of account, the prices on goods could not be measures or quoted. Due to the absence of a common unit of account, disagreements between exchangers may difficult the bartering process.
I believe the answer is c. wars
