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# GMATPrep IR- Marco: Giant kangaroos - one of several extinct species

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Intern
Joined: 29 Mar 2017
Posts: 28
Location: India
GMAT 1: 650 Q48 V32
GPA: 3.16
WE: Operations (Manufacturing)
GMATPrep IR- Marco: Giant kangaroos - one of several extinct species  [#permalink]

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24 Sep 2017, 01:28
1
Marco: Giant kangaroos - one of several extinct species of large mammals (megafauna) - went extinct around 46,000 years ago. The deposits and wear patterns on the teeth of these animals from around the time of their extinction indicate that they fed mostly on saltbrush shrubs. Saltbrush thrives in arid climates, so it is not likely that the kangaroos' food supply was adversely affected by the increasing aridity of the climate at that time. Thus, something else would have to account for their extinction, and the best candidate for that cause is predation by humans.

Fatima: That argument alone is not likely to satisfy many researchers in this field. Have you found any other evidence to bolster your conclusion ?

Select Marco for the statement that, if true, most justifies Marco's assertions, and select Fatima, for the statement that, if true, most justifies Fatima's skepticism about Marco's assertions. Make only two selections, one in each column.

A) Giant kangaroos became extinct during a period that was less arid than previous periods they endured.

B)Many researchers believe humans first arrived in Australia around 40,000 years ago.

C)Approximately 60 different species in Australia died out in the wave of extinctions around 46,000 years ago.

D)Fossils of giant kangaroos also sho evidence that those animals' diets routinely included plants other than saltbrush.

E)Several types of megafauna larger than the giant kangaroo went extinct around 46,000 years ago.
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Re: GMATPrep IR- Marco: Giant kangaroos - one of several extinct species  [#permalink]

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15 Oct 2017, 07:58
2
Marco states that human predation might have caused the Giant kangaroos extinction. Fatima is skeptic about this.

A: None. This doesn't support Marco's statement. It might mean that kangaroo died due to less availability of saltbrush shrub. They haven't endured such an arid climate yet.

B : Fatima
This directly supports her doubts. If humans reached Australia 40,000 years ago, they can't cause extinction 46,000 years ago.

C: This doesn't impact the argument.

D: Marco
If Kangaroo's diet included something other than saltbrush shrub, it supports that something else (not unavailability of saltbrush shrub) would have to cause the extinction

E: This is mentioned in passage (one of several extinct species of large mammals ), and doesn't impact.
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Re: GMATPrep IR- Marco: Giant kangaroos - one of several extinct species  [#permalink]

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19 Oct 2017, 16:35
Abhishiek wrote:
Marco states that human predation might have caused the Giant kangaroos extinction. Fatima is skeptic about this.

A: None. This doesn't support Marco's statement. It might mean that kangaroo died due to less availability of saltbrush shrub. They haven't endured such an arid climate yet.

B : Fatima
This directly supports her doubts. If humans reached Australia 40,000 years ago, they can't cause extinction 46,000 years ago.

C: This doesn't impact the argument.

D: Marco
If Kangaroo's diet included something other than saltbrush shrub, it supports that something else (not unavailability of saltbrush shrub) would have to cause the extinction

E: This is mentioned in passage (one of several extinct species of large mammals ), and doesn't impact.

That's what I thought too but the answer is A for Marco (and B for Fatima). Still not sure why.
Re: GMATPrep IR- Marco: Giant kangaroos - one of several extinct species &nbs [#permalink] 19 Oct 2017, 16:35
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# GMATPrep IR- Marco: Giant kangaroos - one of several extinct species

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