Drugs that have effects similar to those of norepinephrine and epinephrine are called sympathomimetic drugs. Which of the following symptoms would you expect to observe in a person who has taken an excess of sympathomimetic drugs? a. sweating
b. dilation of the pupil
c. rapid respiration
d. decreased blood pressure
e. Decrease digestive activity

it creates acid rain

the answer is lactic acid from anaerobic respiration. the acid in lactic acid is what creates sore and burning muscles. if you think about how acid burns that will give you a clue for questions like this.

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).