Answer:
a) both processes first break down glucose into pyruvic acid
Step-by-step explanation:
Cellular respiration is the process through which cells of living organisms derive their energy. Cellular respiration can be carried out with oxygen (aerobic) or without oxygen (anaerobic). The oxygen actually acts as a final electron acceptor in the last stage of aerobic respiration process (ETC).
Cellular respiration starts with GLYCOLYSIS, which is the process whereby glucose is broken down to pyruvic acid. Glycolysis occurs in the cytoplasm and does not require oxygen to occur. In a complete respiration, the step progresses into the Kreb's cycle and Oxidative phosphorylation, which occurs in the mitochondria.
Hence, GLYCOLYSIS (break down of glucose to pyruvic acid) is a common process to both aerobic and anaerobic.