What process is common to both aerobic and anaerobic resoiration?

- Photosynthesis
- Glycolvsis
- Fermentation
- Kreb's Cycle

The process that is common to both aerobic and anaerobic respiration is glycolysis. Glycolysis is the first stage of cellular respiration, where glucose is broken down into pyruvate, producing a small amount of ATP (adenosine triphosphate) and NADH (nicotinamide adenine dinucleotide + hydrogen).

- Photosynthesis is a process used by plants and other organisms to convert light energy into chemical energy, not involved in either aerobic or anaerobic respiration.

- Fermentation occurs after glycolysis under anaerobic conditions, where pyruvate is converted into lactic acid or alcohol, depending on the organism, without the involvement of the Krebs cycle or electron transport chain that occurs in aerobic respiration.

- The Krebs Cycle (also known as the Citric Acid Cycle) is a part of aerobic respiration occurring in the mitochondria after glycolysis if oxygen is present. It does not occur in anaerobic respiration.