Final answer:
Beveled gears demonstrate the unique capability of changing drivetrain direction by transmitting rotational motion and changing the direction of the shafts they are connected to.
Step-by-step explanation:
Beveled gears demonstrate the unique capability of changing drivetrain direction.
Beveled gears have teeth that intersect at an angle which allows the gears to change the direction of the shafts they are connected to.
For example, if gear A turns clockwise and meshes with gear B, which turns counterclockwise, the beveled gears will transmit the rotational motion and change the direction of the drivetrain.