Which ecosystem contains 32% of the world's producers?

a. terrestrial ecosystem.

b. freshwater ecosystem.

c. aquatic ecosystem.

d. marine ecosystem

The correct answer is letter D. Marine Ecosystem. Thirty-two percent of the world's producers is in the marine ecosystem. It is where most of the aquatic resources are located - mangroves, lagoons, reefs, sea floor, etc. The salt content here is higher compared to freshwater.