Brown bears in captivity frequently pace back and forth on the same spot, swing their heads from side-to-side, and engage in other obsessive patterns of behavior that show signs of stress. they behave this way even when their living areas are spacious and include elements similar to those found in their natural habitat. this shows that conditions of captivity are not a satisfactory substitute for the brown bear's natural environment. which of the following statements best expresses the main conclusion of the above argument?