The correct answer is D), because, as he is throwing the ball, the potential energy, that was stored in the ball, changes into kinetic energy, but there is no energy increase or decrease.
Ans. C. as the man above said its C, the trachea, this is true, im also taking the test and i looked up the body system and thats where the trachea is, were x is
C.
C.
Answer is C.
Matrix are within the inner membrane of the mitochondria.
