Which of these cellular metabolic processes occurs in all living things?

A. glycolysis

B. Krebs cycle

C. Electron Transport System

D. photosynthesis

The answer is glycolysis

All options save for photosynthesis (which we know only plants can do) are involved in respiration of some sort. Glycolysis is the only process of the options provided which does not involve oxygen. This means all living things can undergo this process.

The answer is glycolysis.