On which industry do the economies of caribbean nations most heavily rely?

Caribbean industries rely on natural resources, agricultural and tourism.  Some countries in this area are rich in various minerals and marine life. They also are heavily involved in agriculture where they derive their food production.  Tourism is one of their biggest industries as the islands make ideal vacation spots that tourist go to during the holidays.

2. this rock sample is limestone and shale. with what you know about rock formation, what type of environment did these organisms live in?