The magic school bus goes small to hang with the bugs and nectar as plants are pollinated and seeds produced. As a twist, they go back to Phoebe's old school and even see her old teacher. (Thus when she talks about her old school, they respond that they are there.)
The Magic School Bus Gets Ants in Its Pants: A Book about Ants by Linda Ward Beech (Author), John Speirs (Illustrator)
This magic school bus book was adapted from the TV show. The quality of the illustrations and stories were not as good as the regular books. (Despite not writing it, the series originators took the copyright credit.) In this one, they become ants and explore the different roles of ants.
