The class is turned into insects to learn about them.

The whole class gets field trip. They find out pretty quickly that lots of insects eat other insects for lunch. And, there is a little issue of spiders, too. Yi

When Wanda brings her pet ladybugs to school to learn how to take care of them, Ms. Frizzle decides to teach the class about insects, and soon the entire class

Ms. Frizzle takes her class on a field trip through the town's electrical wires so they can learn how electricity is generated and how it is used.