I think in this Cr, scientists are trying to prove this..Monarch butterflies, whose average life span is nine months, migrate from the midwestern United States to selected forests outside Mexico City. It takes at least three generations of monarchs to make the journey, so the great-great-grandchildren who finally arrive in the Mexican forests have never been there before. Yet they return to the same trees their forebears left. Scientists theorize that monarchs, like homing pigeons, map their routes according to the earth’s electromagnetic fields. As a first step in testing this theory, lepidopterists plan to install a low-voltage transmitter inside one grove of “butterfly trees” in the Mexican forests. If the butterflies are either especially attracted to the grove with the transmitter or especially repelled by it, lepidopterists will have evidence that______
(A) monarch butterflies have brains, however minuscule
(B) monarch butterflies are sensitive to electricity
(C) low-voltage electricity can affect butterflies, whether positively or adversely
(D) monarchs map their routes according to the earth’s electromagnetic fields
(E) monarchs communicate in intergenerationally via electromagnetic fields
Scientists theorize that monarchs, like homing pigeons, map their routes according to the earth’s electromagnetic fields.As a first step in testing this theory
If this is the thing, i dont see why D is incorrect??
If C is the correct answer then the CR is playing a smart shell-game by trickily removing monarch from it in the last sentence..
If the butterflies are either especially attracted to the grove with the transmitter or especially repelled by it, lepidopterists will have evidence that
IMO,I dont feel B is the answer coz scientiests are not testing the butterflies sensitivity towards something.(If B is correct,it needs an additional assumtion )
As for the 2nd CR,
I feel B is the right answer.In a marketing study, consumers were given two unlabeled cartons of laundry detergent. One carton was bright green and yellow; the other was drab brown and gray. After using the detergent in the two cartons for one month, 83 percent of the consumers in the study reported that the detergent in the bright green and yellow carton cleaned better. This study shows that packaging has a significant impact on consumers’ judgment of the effectiveness of a laundry detergent.
Which of the following, if true, would most strengthen the conclusion drawn in the marketing study?
(A) The detergent in the bright carton contained bleach crystals; the detergent in the drab carton did not.
(B) The detergents in the two cartons were the same.
(C) The detergents in the two cartons were different, but they had both been laboratory tested.
(D) The detergent in the drab carton was a popular name brand; the detergent in the bright carton was generic.
(E) The detergent in the drab carton was generic; the detergent in the bright carton was a popular name brand.
Cause then only the conclusion will hold:
This study shows that packaging has a significant impact on consumers’ judgment of the effectiveness of a laundry detergent
If both the detergents are not same then the argument is weakened by the assumtion that there are some other factors(such as quality,bleaching crystals,etc) that is leading the consumers to report that the detergent in the bright green and yellow carton cleaned better
