Mutation is a change in DNA, the hereditary material of life. An organism's DNA affects how it looks, how it behaves, and its physiology  all aspects of its life. So a change in an organism's DNA can cause changes in all aspects of its life.
continuously variable transmission (CVT)=An automatic transmission that can change seamlessly through an infinite number of effective gear ratios between maximum and minimum values. Automatic transmission= Automatically change gear ratios as the vehicle moves, freeing the driver from having to shift gears manually.
Hydraulic or electric actuators will shift between the gears automatically. A CVT is a type of automatic transmission, in that no intervention by the driver is needed. The basic principle is to have two pulleys that can change size, and hence the gear ratio. This way, there are no fixed steps, and the gear ratio can be changed smoothly between the low and high limits.