Answer:
a.) Cellular Respiration / Aerobic Respiration
b.) This reaction occurs in both animals and plants. While cellular respiration is the main way that animals access energy, it is not necessarily the main way plants get energy. Plants can undergo cellular respiration because this process usually happens at night when no light is available for photosynthesis. They also have a mitochondria which purpose is to use glucose to make ATP.
c.) This process takes place in all cells in the mitochondria.
d.) This process is necessary for accessing ATP (energy). This energy is needed to power the organisms' normal functioning.