Question

What is one of the most important roles of the rainforest ?

Answer 1

THEY PROVIDE A HABITAT FOR PLANTS AND ANIMALS
THEY HELP TO PREVENT THE SOIL EROSION
THEY REGULATE CLIMATE

Answer 2

One of the most important roles of the rainforest is moderate destructive drought and rain cycles in local areas.
There are many more important roles that a rainforest may play, some of them were mentioned by the person above.