When one type of bacteria overgrows (usually from eating too much sugar), the "ecosystem" gets out of whack.
The episode begins with the class preparing for a fun day at the carnival. However, the focus quickly shifts when they realize that is particularly "funky." To solve the mystery of why breath smells and how ecosystems work, Ms. Frizzle shrinks the bus and takes the students on an expedition inside a mouth. [S2E7] Ferris Wheels & Funky Breath
There are over 700 different species of bacteria that can live in a human mouth. When one type of bacteria overgrows (usually from