Which of the following is the main disadvantage of using shells as money instead of coins?
portability durability divisibility uniformity

The main disadvantage of using shells as money instead of coins is uniformity.

Shell money was a medium of exchange similar to money that was used in many parts of the world. Whole sea shells or pieces of them were used as shell money. Since shells were used as body ornaments, they were used for direct commodity exchange. But because of their difference in size and color, coins were introduced.