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Please help for Anatomy&Physiology!

Please help for Anatomy&Physiology!-example-1

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Answer:

A. is my answer

im not sure

Step-by-step explanation:

Blood doping is an illicit method of improving athletic performance by artificially boosting the blood's ability to bring more oxygen to muscles. In many cases, blood doping increases the amount of hemoglobin in the bloodstream.

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