Select the incorrect statement. a. for the most part, drugs of abuse decrease the activity of dopamine in the limbic system. b. the reticular activating system to regulate the brain's state of arousal. c. drugs that alter the activity of dopamine-releasing neurons often affect motor activity. d. parkinson's disease is due to damage of dopamine neurons in the basal ganglia.

a

Explanation:

actually we don't know what causes the drug to decrease

my teacher would say no s

the last one: artificial selection/genetic engineering

plant breeding is modifying the genetic composition of the plant - but this isn't cloning (which is specifically introducing a gene into a genome). but you are artificially selecting for the phenotype that you want.

the second one is literally genetic engineering - the gene would have been cloned first and then inserted or genetically engineered into the new plant cell (the cotton).