Idk what is growing but if it’s a free than c
B.) A group of cells working together. If it were D.), the question would have had to be A cell is made up of...
The wave speed completely depends on the characteristics and properties of the medium . . . physical properties for mechanical waves, electrical properties for electromagnedtic waves.
So if you want to change the speed of a wave, you have to change the medium . . . shoot it through some different kind of stuff. <em>(B) </em>
