Which of the following is NOT something that electromagnetic waves and mechanical waves have in common? A. Both can transmit energy through a medium.
B. Both involve the repeated vibrations of particles
.C. Neither of the waves can move matter.
D. In both, vibrations occur in a parallel direction to the direction of the wave.

D. In both, vibrations occur in a parallel direction to the direction of the wave.

Explanation:

It is not true that in both mechanical and electromagnetic waves, vibrations occur in  parallel direction to the direction of the wave.

As with all waves, they are disturbances that transfers energy without moving the materials of the medium.

because u need two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei to form isotopes.

so since they all have the same shape? i mean maybe because m& m and reeses are both chocolates