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12. Morphine and codeine are the chief mind-affecting chemicals in the pain-relieving drug __________. A. heroin B. opium C. methadone D. All of the above
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12. Morphine and codeine are the chief mind-affecting chemicals in the pain-relieving drug __________.

A. heroin

B. opium

C. methadone

D. All of the above

User Matteo Monti
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5.2k points

1 Answer

3 votes

all of the above is the answer

User Leith
by
6.0k points
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