Final answer:
The process shared between anaerobic metabolism and aerobic metabolism is glycolysis.
Step-by-step explanation:
The process shared between anaerobic metabolism and aerobic metabolism is glycolysis. Glycolysis is the initial step in both anaerobic and aerobic respiration, where glucose is broken down into pyruvate. In anaerobic metabolism, pyruvate is further converted into lactic acid or ethanol, while in aerobic metabolism, pyruvate enters the mitochondria and undergoes the Citric Acid Cycle and Electron Transport Chain to produce ATP.