The Magic School Bus 3x11

The kids rent a rainforest cocoa tree as an Earth Day present for Ms. Frizzle. But when the harvest arrives, there’s only one shrivelled cocoa bean! Ms. Frizzle takes the class to the rainforest to meet the impeccable Inspector 47 who keeps a tidy, mud-free cocoa grove. What has he done to the rainforest's intricate ecology web?