Why is it more likely that a sea cave becomes a sea arch before becoming a sea stack?

Based on my research, I'd say it becomes a Sea arch before becoming a Sea stack due to the breaking waves erode, or wear away, the rock at sea level bit by bit, forming arches. Softer rock falls away more quickly than harder rock.

Explanation:

A sea stack is a pillar of rock that is cut off from the headland or cliff. When the waves erode the base of the sea arch, they widen it. Eventually, the roof is unable to support itself and it collapses, the former tip of the headland cut off as a sea stack.

answer: 20 percent

the fish culture has become a developing commercial practice in developing countries which is already prominent in developed countries of the world. the major fish protein demand is being supplemented in developing countries is   fishing to meet the needs of the growing population. therefore, in some developing nations, the percentage of animal protein from fish in the diet can be as high as 20 percent.