Answer: a bowling ball ...
Explanation:
When our body requires to more energy in the absence of oxygen it performs anaerobic respiration.
In the absence of oxygen the terminal electron acceptor , pyruvate produced form glycolysis undergoes anaerobic respiration to produce lactic acid and replenish the NADH required for glycolysis for producing more ATP.
REFER brainly.com/question/13943624
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Most likely a hydrogen bond?