What form of transportation does not cause diseases or harm crops?  
Earthworms animals automobile mechanical train airplane Movement bicycle
A B C D E F G H
Air pollution can cause diseases and harm crops.
Riding a bike does not cause diseases or harm crops
What form of transportation does not cause diseases or harm crops?   (A) Earthworms (B) animals (C) automobile (D) mechanical (E) train (F) airplane (G) Movement (H) bicycle