Answer:
Gas exchange during respiration occurs primarily through diffusion. Gas molecules move from a region of high concentration to a region of low concentration. Blood that is low in oxygen concentration and high in carbon dioxide concentration undergoes gas exchange with air in the lungs.
Explanation:
An organic compound consists of carbon...
Answer:
Net force=120N-90N=30N
30N to the right
D, because the air s moving as in longitudinal waves which means <span>a wave vibrating in the direction of propagation, and probation means that the making of more and replacing</span>
