Which of the following are the three primary ecosystems found on Earth?
A.
grassland, rainforest, and ocean
B.
freshwater, rainforest, and desert
C.
freshwater, terrestrial, and ocean
D.
grassland, terrestrial, and desert
A.
grassland, rainforest, and ocean
B.
freshwater, rainforest, and desert
C.
freshwater, terrestrial, and ocean
D.
grassland, terrestrial, and desert