Why is the activity shown in this photograph vital to the economies of many islands in Micronesia?

fish is their most abundant resource and their main source of income

Explanation:

This activity is vital to the economies of many islands in Micronesia because fish is their most abundant resource and their main source of income. This allows them to be able to survive. Islands such as this one depend on fishing for food and to maintain a healthy and stable economy by exporting their resources to other nearby countries that would be willing to pay for such a product. Therefore, providing the islands with a steady inflow of money.

your answer would be just capitalism.