Fact 1: Plucking a string can cause that string to vibrate.

Fact 2: When the strings on a guitar vibrate, they transmit their vibrations to the saddle.

Given the two facts above, answer the question "What vibrates the saddle?" with the following options: 
- voltage
 - friction
 - nerves
 - heat energy
 - mechanical
 - plucking
 - energy
 - waves


 

      plucking   