Researchers at a pharmaceutical company tested a new sunscreen formula. they applied the new formula to one arm and the old formula to the other arm of each of a set of individuals, randomly choosing the arms for each formula. what type of problem is this?

can you tell me where are the ansawer choices

the answer is : the nut cases won't quit battling and their recurrence of flights will going to continue as before despite the fact that the battles are less hazardous now because of their bills have all of a sudden been blunted.   in the falcon dove diversion, two creatures will drive towards one another to crush one another, among the two one will win and other will swerve. in this way, clearly, the battle will be dependably there between two creatures for the assets or mate.

answer; the automatic system because it is a "gut reactor"