What is the most important role of the ecosystems of the andes?
question 21 options:
keep the environment stable and reduces air pollution
reduce the chance of floods, desertification, and landslides
regulate the availability of freshwater
all of the above

All of the above choices are most important roles that the ecosystems of the Andes play. These are: (1) Keeping the environment stable and reducing air pollution, (2) Reducing the chance of floods, desertification, and landslides, and (3) Regulating the availability of freshwater. These are all important in order to keep a balanced and healthy ecosystem for all.

A,b,c is the answer to the question