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Final answer:The medulla is the brain structure that was most likely damaged in the accident, causing Chris'sinabilityto send messages to breathe. This damage requires him to use a respirator.Explanation:The brain structure that was most likely damaged in the auto accident is themedulla. The medulla is responsible for controlling vital functions such as breathing, heart rate, and blood pressure. In this case, the damage to Chris's nervous system has resulted in an inability to send messages to breathe,requiringhim to rely on arespirator.Learn more aboutMedullahere:brainly.com/question/34195477#SPJ11...