Answer the following question given this paragraph: 

The rate of evolution depends on how many of an organism’s genes have changed over a period of time. Evolution is usually so gradual that we do not see the change for many, many generations. The rate of evolution also depends on the generation time of a particular species.


Q: The rate of what process depends on how many of an organism’s genes have changed over a period of time and on the generation time of a particular species?

 Choices:

- digestion

- respiration

- photosynthesis

- evolution

A:
evolution
