Where might you expect to find the greatest variety of kinds of marine organisms? a. deep waters of the equatorial pacific ocean b. deep waters of the arctic ocean c. in somewhat polluted estuaries d. shallow waters of the caribbean sea

Most of the marine organisms are expected to be found in the shallow waters of the Caribbean Sea.  The shallow waters are favorable for the survival of the organism. The shallow waters are warmer since then rays of the sun can easily penetrate and thus favoring the survivor of many organisms
Explanation:
Caribbean ocean, sea basin of the western Atlantic OceanThe climate of the Caribbean typically is tropical, however there are nice native variations, betting on mountain elevation, water currents, and also the trade windsThe shallow-water marine fauna and flora of the Caribbean centres around the submerged fringing coral reefs, that support various assemblages of fishes and different kinds of marine life. The climate is suitable for marine life

81 is a composite number