using coal to generate electricity discovering a new species of snake developing an antibiotic to treat infections changing the definition of the term planet
In science, old ideas can be changed when new discoveries alter existing information. Which situation is most likely an example of a rethinking of an existing idea?

Options:
- using coal to generate electricity
- discovering a new species of snake
- developing an antibiotic to treat infections
- changing the definition of the term planet

changing the definition of the term planet