what best describes a sound wave?\no transverse and electromagnetic\no longitudinal and mechanical\no…

Brief Explanations:

Sound waves are mechanical waves as they require a medium (like air, water, or solids) to travel through. They are longitudinal waves where the particles of the medium vibrate parallel to the direction of wave propagation. They are not electromagnetic as they don't involve electric and magnetic fields in the way electromagnetic waves do. Transverse waves have particles vibrating perpendicular to the wave - propagation direction, which is not the case for sound waves.

Answer:

longitudinal and mechanical