Where in the cell does this first stage of cellular respiration take place

Ineed to know why d is the correct answer asap

How energy flows through each level in this energy pyramid. is all the matter and energy from one level transferred to the next level?

Define the apical impulse and describe its normal location, size, and duration. which abnormal conditions may affect the location of the apical impulse? explain the mechanism producing normal first and second heart sounds. describe the effect of respiration on the heart sounds. describe the characteristics of the first heart sound and its intensity at the apex of the heart and at the base. describe the characteristics of the second heart sound and its intensity at the apex of the heart and at the base.