Why would your muscle cells switch to anaerobic respiration if it doesn't produce as much ATP? Help please

Answer is in the photo. I couldn't attach it here, but uploaded it to a file hosting. link below! Good Luck!

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Lack of oxygen

Explanation:

There are two mechanisms for energy production (glucose breakdown), aerobic and anaerobic. When adequate amounts of oxygen are present, aerobic mechanism is used. However, when there is insufficient oxygen, such as during exercise, the anaerobic mechanism is used.

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