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30 Jan 2020, 04:42
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C
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Difficulty:
45%
(medium)
Question Stats:
70% (02:32) correct
30%
(02:29)
wrong
based on 1315
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Although most species of nondomestic mammals in Australia are marsupials, over 100 species—including seals, bats, and mice—are not marsupials but placentals. It is clear, however, that these placentals are not native to this island continent: all nonhuman placentals except the dingo, a dog introduced by the first humans that settled Australia, are animals whose ancestors could swim long distances, fly, or float on driftwood.
The conclusion above is properly drawn if which one of the following is assumed?
(A) Some marsupials now found in Australia might not be native to that continent, but rather might have been introduced to Australia by some other means.
(B) Humans who settled Australia probably introduced many of the placental mammal species now present on that Continent.
(C) The only Australian placentals that could be native to Australia would be animals whose ancestors could not have reached Australia from elsewhere.
(D) No marsupials now found in Australia can swim long distances, fly, or float on driftwood.
(E) Seals, bats, and mice are typically found only in areas where there are no native marsupials.
The conclusion above is properly drawn if which one of the following is assumed?
(A) Some marsupials now found in Australia might not be native to that continent, but rather might have been introduced to Australia by some other means.
(B) Humans who settled Australia probably introduced many of the placental mammal species now present on that Continent.
(C) The only Australian placentals that could be native to Australia would be animals whose ancestors could not have reached Australia from elsewhere.
(D) No marsupials now found in Australia can swim long distances, fly, or float on driftwood.
(E) Seals, bats, and mice are typically found only in areas where there are no native marsupials.
31 Jan 2020, 13:45
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Bunuel
Correct answer: C
(A): Incorrect. The argument only concerns the introduction of placental mammals to the continent. The argument states that all nonhuman placental mammals could have traveled to the continent; therefore, the argument assumes that Australia's placental animals could have arrived from elsewhere.
(B): Incorrect. The argument states that, other than the dingo (introduced by humans), Australia's placental mammals could have arrived from afar by themselves. They need not have been introduced by humans.
(C): Correct. The argument assumes that all placentals that have the capacity to arrive to Australia (e.g. by flight) would not have been native to the continent; only those that could not could be native (e.g dingos, for which the author provides the explanation that they were introduced by humans).
(D): Incorrect. The argument only concerns placentals arriving to Australia, not marsupials.
(E): Incorrect. Out of scope; whether marsupials coexist with placentals does not determine whether placentals could be native to the continent.
27 Aug 2021, 22:43
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Although most species of nondomestic mammals in Australia are marsupials, over 100 species—including seals, bats, and mice—are not marsupials but placentals. It is clear, however, that these placentals are not native to this island continent: all nonhuman placentals except the dingo, a dog introduced by the first humans that settled Australia, are animals whose ancestors could swim long distances, fly, or float on driftwood.
The conclusion above is properly drawn if which one of the following is assumed?
Blue text is the conclusion. Dark blue is provided more details as support to the conclusion.
(A) Some marsupials now found in Australia might not be native to that continent, but rather might have been introduced to Australia by some other means. - WRONG. Irrelevant. Need to place importance to placentals more than marsupials.
(B) Humans who settled Australia probably introduced many of the placental mammal species now present on that Continent. - WRONG. Open so much that it can go in either direction.
(C) The only Australian placentals that could be native to Australia would be animals whose ancestors could not have reached Australia from elsewhere. - CORRECT. Strikes right cords. Does the opposite of what the support to conclusion did - kind of an exception discussed.
(D) No marsupials now found in Australia can swim long distances, fly, or float on driftwood. - WRONG. Like A, this is irrelevant.
(E) Seals, bats, and mice are typically found only in areas where there are no native marsupials. - WRONG. Again irrelevant.
Answer C.
The conclusion above is properly drawn if which one of the following is assumed?
Blue text is the conclusion. Dark blue is provided more details as support to the conclusion.
(A) Some marsupials now found in Australia might not be native to that continent, but rather might have been introduced to Australia by some other means. - WRONG. Irrelevant. Need to place importance to placentals more than marsupials.
(B) Humans who settled Australia probably introduced many of the placental mammal species now present on that Continent. - WRONG. Open so much that it can go in either direction.
(C) The only Australian placentals that could be native to Australia would be animals whose ancestors could not have reached Australia from elsewhere. - CORRECT. Strikes right cords. Does the opposite of what the support to conclusion did - kind of an exception discussed.
(D) No marsupials now found in Australia can swim long distances, fly, or float on driftwood. - WRONG. Like A, this is irrelevant.
(E) Seals, bats, and mice are typically found only in areas where there are no native marsupials. - WRONG. Again irrelevant.
Answer C.
