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19 June, 12:45

Julianna is a nine-year-old child diagnosed with attention deficit hyperactivity disorder. Her mother was a chain smoker even after Julianna was conceived. Which of the following factors is chiefly responsible for her condition? A. Julianna has one form of a dopamine gene but not the other. B. Julianna has abnormal brain growth rate. C. Julianna consumed excess amounts of sugar as an infant. D. Julianna inherited both forms of a dopamine gene from her mother. E. Julianna has one form of a dopamine gene but not the other

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  1. 19 June, 13:00
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    I think it's a. julianna has one form of dopamine gene but not the other
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