Please help me in this question

IV. He encouraged casteism...

Hey mate hope its help you

the question is which one among are fake about guru Nanak

Explanation:

4th one because he didn't agree with casteism.

hope it helps

please mark as BRAINLIEST PLS

A mechanical wave is a wave that is not capable of transmitting its energy through a vacuum. Mechanical waves require a medium in order to transport their energy from one location to another. A sound wave is an example of a mechanical wave. Sound waves are incapable of traveling through a vacuum. A mechanical wave is a wave that is an oscillation of matter, and therefore transfers energy through a medium. While waves can move over long distances, the movement of the medium of transmission the material is limited. Therefore, the oscillating material does not move far from its initial equilibrium position. Hope this helps!