Answer the following question given this paragraph: 

When geologic and climatic conditions are stable, evolution may occur gradually. This is how Darwin thought evolution occurred. This model of the timing of evolution is called gradualism .


Q: What term is used for darwin's idea that in stable geologic and climatic conditions evolution occurred gradually?

 Choices:

- elitism

- tinkering

- canibalism

- gradualism

A:
gradualism
