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# Economist Tutor CAT IR Two-part Question

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Manager
Joined: 03 Jan 2016
Posts: 106
Location: India
GMAT 1: 640 Q49 V29
GMAT 2: 760 Q51 V41
GPA: 3.2
Economist Tutor CAT IR Two-part Question  [#permalink]

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29 Jan 2017, 00:59
1
Marine biologist: While we have known that larger marine animals such as whales and dolphins communicate using sound, the fact that smaller marine animals also use sound is a relatively new discovery. These low-frequency sounds produced by animals in the mesopelagic zone--that area between 200 and 1,000 meters below the ocean surface--may be evidence that these smaller animals can communicate when it is time to feed. Understanding more about which marine populations use sound would lead to a better understanding of the ocean's ecosystem, including which animals feed on animals from the mesopelagic zone.

Indicate two different statements as follows: one statement identifies an assumption required by the marine biologist's argument and the other identifies a possible fact that, if true, would provide significant logical support for the required assumption. Make only two selections, one in each column.

Assumption Required / Possible Fact

1. The sound is about five decibels louder than the ocean's background noise.

2. Sound travels farther underwater than was first suspected.

3. The sound made by the smaller animals is a buzzing or humming that goes on for up to two hours.

4. Marine animals found in the mesopelagic zone must feed outside the zone.

5. Marine animals that once used chemical cues to indicate feeding times have been found to also use sound.

6. Marine animals producing sounds in the mesopelagic zone are only eaten by animals living outside of the zone.
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Joined: 13 Dec 2016
Posts: 42
Re: Economist Tutor CAT IR Two-part Question  [#permalink]

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07 Feb 2017, 06:06
ZenYogi, Quite a tricky question. Can you please post the official answer ?
Manager
Joined: 03 Jan 2016
Posts: 106
Location: India
GMAT 1: 640 Q49 V29
GMAT 2: 760 Q51 V41
GPA: 3.2
Re: Economist Tutor CAT IR Two-part Question  [#permalink]

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10 Apr 2017, 12:11
OA- 6/4
_________________

How ZenYogi got from 640 to 760
_________________

Trust yourself, you must

Your Kudos, I appreciate

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Joined: 14 Sep 2017
Posts: 4
Re: Economist Tutor CAT IR Two-part Question  [#permalink]

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11 Feb 2018, 03:00
From The Economist GMAT explanation (not mine; hoping this will help others):

In order to solve this two-part Integrated Reasoning question, you are asked to find two things: a required assumption and a possible fact that provides logical support for this assumption. You know that it is necessary to find the assumption first, as the fact is dependent on it.

First, break down the argument to help you find the required assumption.

Premise 1: Animals in the mesopelagic zone communicate when it is time to feed using low-frequency sounds.

Premise 2 (possible fact that logically supports the assumption): __?
+
Required Assumption: __?
=
Conclusion: Understanding these sounds would lead to knowing which animals outside the zone feed on animals from the mesopelagic zone.

In order for the marine biologist to conclude that understanding the use of sound in marine animal communication could aid in knowing which animals outside the mesopelagic zone feed on those from the zone, then the required assumption is that these animals are only eaten by animals outside of the zone and not within it.

The possible fact that best supports this assumption is that the marine animals inside the mesopelagic zone must leave it in order to feed, thus exposing themselves to the other marine animals.
Re: Economist Tutor CAT IR Two-part Question &nbs [#permalink] 11 Feb 2018, 03:00
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# Economist Tutor CAT IR Two-part Question

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