A. tropical rain forest
B. temperate grassland
C. desert
D. tundra
✅ The correct answer is option A.
Aquatic environments, such as coral reefs, estuaries, swamps and marshes, and terrestrial environments, including tropical rainforests, tropical seasonal forests, temperate evergreen forests, and temperate deciduous forests have the highest levels of primary productivity.
Aquatic environments, such as coral reefs, estuaries, swamps and marshes, and terrestrial environments, including tropical rainforests, tropical seasonal forests, temperate evergreen forests, and temperate deciduous forests have the highest levels of primary productivity.