Which of the following is an aspect of a countercurrent exchange system? A. Active movement against a concentration gradient
B. Parallel movement induced by a concentration gradient
C. Passive movement induced by a concentration gradient
D. Random movement against a concentration gradient

it's d. aerobic]

explanation:

for  example, forests have higher evapotranspiration than other ecosystems,  such  as grasslands, because of their deeper roots and greater leaf area. thus forests have a net moistening effect on the atmosphere and become a moisture source for downwind ecosystems.

this is a good question! i'll do some research and come back when i have the answer!