Coins were developed as a medium of exchange because other items like cows, grain, and land were more difficult to move from place to place true or false?
That's true. Land is especially difficult to move :P. In addition, it's harder to measure the worth of something like a cow. Cows have many variables in their value, such as size, health, nutrition, etc. Establishing a monetary system that uses coins with set values helps to avoid that difficulty.