Here's why:
* Pedal is often used in anatomy to describe a foot-like structure, like the pedal extremities of a reptile or amphibian.
* Pedal can also be used in the context of pedalogy, the study of the feet and their pathologies.
* Pedal is also commonly used in biology to describe foot-like structures used for locomotion or attachment, like the "pedal disc" of certain marine animals.
Therefore, "pedal" doesn't have a single specific meaning in science. It's important to look at the surrounding information to determine the intended meaning.