What do inventors have to know about to create a prosthetic arm? / What scientific principles might have guided the inventors of this prosthetic arm?

Explanation:

they have to know the volume of the arm and then they created

it looks like its all of the above. [.wpal1kojopfdpojfrfionrnif.knfdsnksjosjo]

explanation:

you have to combine all of your answers together to

.wpal1kojopfdpojfrfionrnif.knfdsnksjosjo

answer; interpreting someone's past consistent with present deviance;