Being preserved in an area that had a concentration of would increase an organism's likelihood of being preserved in the fossil record.

answer:

Explanation:

Being preserved in an area that had a low concentration of  oxygen would increase an organism's likelihood of being preserved in the fossil record.

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the answer is lactic acid from anaerobic respiration. the acid in lactic acid is what creates sore and burning muscles. if you think about how acid burns that will give you a clue for questions like this.