Lactic acid fermentation occurs in

any environment where oxygen is present
yeast cells
the mitochondria of plant cells
muscle cells

The correct answer is the "muscle cells" option.

Explanation:

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During physical exercise, if there is not enough oxygen in the muscles, lactic fermentation occurs.

These happens due to the formation of lactic acid in the muscles due to lack of oxygen.

We conclude that the correct answer is the "muscle cells" option.

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