The neurotransmitter has been a primary focus of drug abuse research because of its well-known effect on a part of the brain's reward system known as the nucleus accumbens. drugs that increase the activity of this neurotransmitter are most likely to result in physical dependence.

The correct answer is:  "dopamine" .

            "The neurotransmitter    dopamine  has been a primary focus of drug abuse research because of its well-known effect on a part of the brain's reward system known as the nucleus accumbens.  Drugs that increase the activity of this neurotransmitter are most likely to result in physical dependence."

Letter d i believe letter d

Ithink the correct answer would be that since the disease is passed by a hand shake and can be cured with antibiotics that it could be an infection. an example could be that once when i was working in a bush camp, i got blood poisoning from blood blisters that got infected. our cook did not wash his hands after going to the bathroom and he passed staphyloccus on to the crew he fed. one other person also got a bad similar infection on the side of his face. i had to be rescued by helicopter and taken to the hospital so i wouldn't die!