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.
CVT = continuously variable transmission. That's a transmission that doesn't have gears and instead uses pulleys to generate the gearing desired. By doing it this way, they can be continuously varied to generate more than just a few specific gear ratios. A 5-speed manual only has 5 specific gear ratios.