Compare and contrast the relative speed of buffers, the respiratory system, and the kidneys in maintaining the acid-base balance of the blood.

Balance is maintained by secreting bicarbonate ions or by absorbing them.

Explanation:

answer; (c); /out to the side and directly under the dogs neck.

out of the choices i'd say d the ability to set goals, mainly because to desire to continue you need motivation but it isn't motivation in that part, but setting goals means you have an endgame and you want to reach it which sums up motivation.