What do aerobic respiration and anaerobic respiration have in common?
Both begin with glycolysis.
Both occur in mitochondria.
Both require oxygen to proceed.
Both end with the electron transport chain.

They both begin with glycolysis.

Explanation:

Aerobic respiration fits all of those four options. It begins with the glycolysis stage (breakdown of glucose into pyruvate). Part of the process (the Krebs cycle and electron transport chain) occurs in a mitochondrion. Aerobic respiration requires oxygen to progress from glycolysis to the Krebs cycle, and the last stage is the electron transport chain.

Anaerobic respiration also begins with glycolysis (because this stage doesn't require oxygen), but it doesn't occur in the mitochondrion. As I said before, only the Krebs cycle and the electron transport chain occur in the mitochondria. Anaerobic respiration happens in the absence of oxygen, so it can't move onto the Krebs cycle after glycolysis. Instead, the pyruvate produced at the end of glycolysis is turned into either lactic acid (in humans) or ethanol (in yeast), in a process called fermentation. After either lactic acid or ethanol is produced, the process of anaerobic respiration is finished, so there's no electron transport chain.

A: Both begin with glycolysis

Explanation:

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because photosynthesis could not occur (apex)