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# A chemical compound has been developed that disrupts the

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Senior Manager
Joined: 21 Oct 2013
Posts: 435
A chemical compound has been developed that disrupts the [#permalink]

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23 Mar 2014, 14:36
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35% (medium)

Question Stats:

71% (01:37) correct 29% (01:46) wrong based on 610 sessions

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Which of the following most logically completes the argument?

A chemical compound has been developed that disrupts the biological messages responsible for the later stages of embryonic development during the reproduction cycles of certain sea creatures. Upon introduction into an area of the ocean, the compound spreads outwards and downwards, reaching an active depth of up to 20 feet. The inventors of the compound are aiming primarily at offering it as a method for controlling the numbers of jellyfish although this will clearly be unsuccessful since __________.

A) such an invention will most likely be implemented by groups looking to reinstate balance in ecosystems that have been damaged
B) the vertical order of a mixture of different liquids is determined by the relative density of each individual liquid
C) the planula, a pre-embryonic creature spawned from a jellyfish pair, may swim freely in the ocean for several days before reaching its destination on the sea bottom
D) shortly after fertilization, jellyfish larvae become plant-like polyps, which rooted to the sea floor, facilitate budding, and the final release of offspring
E) jellyfish are either male or female, and through the release of sperm and eggs into the open water, perform fertilisation

OE:
This is a Conclusion Weakening question:
Premise A: a chemical has been developed that makes it difficult for some sea creatures to reproduce by causing problems during the later reproductive stages
+
Premise B: when the chemical is placed in the sea, it spreads outwards and downwards and is effective at a depth of up to 20 feet
=
Inventors' Conclusion: the chemical will be effective in controlling jellyfish numberWeakening Data: ?

Answer choice (D) weakens inventors' conclusion and therefore logically completes argument.
If after fertilization, the reproductive process of jellyfish takes place on the sea floor, then the chemical, which is only active in the top 20 feet of the ocean, will not be capable of affecting the reproduction in any way.
Manager
Joined: 23 Jan 2013
Posts: 164
Concentration: Technology, Other
Schools: Haas
GMAT Date: 01-14-2015
WE: Information Technology (Computer Software)
Re: A chemical compound has been developed that disrupts the [#permalink]

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01 Apr 2014, 10:52
p1 : Discovery of a chemical compound which disrupts later reproduction cycles of certain sea creatures
p2 : Compound spreads downwards and active at 20 feet .

Conclusion : It will not be sucessfull because .. prethinking say jelly fish stay lower than 20 feet .

A) such an invention will most likely be implemented by groups looking to reinstate balance in ecosystems that have been damaged : not relevant
B) the vertical order of a mixture of different liquids is determined by the relative density of each individual liquid : Not relevant
C) the planula, a pre-embryonic creature spawned from a jellyfish pair, may swim freely in the ocean for several days before reaching its destination on the sea bottom : talks about pre embryonic stage chemical effect later stages of reproduction out of choice
D) shortly after fertilization, jellyfish larvae become plant-like polyps, which rooted to the sea floor, facilitate budding, and the final release of offspring --- Hold it !! Weakens it since it may be the case since the jelly fish are way below the floor bed and chemical is active at 20 feet
E) jellyfish are either male or female, and through the release of sperm and eggs into the open water, perform fertilisation : Not relevant

Hope this helps
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Joined: 18 Oct 2014
Posts: 882
Location: United States
GMAT 1: 660 Q49 V31
GPA: 3.98
Re: A chemical compound has been developed that disrupts the [#permalink]

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17 Jun 2016, 14:48
1
goodyear2013 wrote:
Which of the following most logically completes the argument?

A chemical compound has been developed that disrupts the biological messages responsible for the later stages of embryonic development during the reproduction cycles of certain sea creatures. Upon introduction into an area of the ocean, the compound spreads outwards and downwards, reaching an active depth of up to 20 feet. The inventors of the compound are aiming primarily at offering it as a method for controlling the numbers of jellyfish although this will clearly be unsuccessful since __________.

A) such an invention will most likely be implemented by groups looking to reinstate balance in ecosystems that have been damaged
B) the vertical order of a mixture of different liquids is determined by the relative density of each individual liquid
C) the planula, a pre-embryonic creature spawned from a jellyfish pair, may swim freely in the ocean for several days before reaching its destination on the sea bottom
D) shortly after fertilization, jellyfish larvae become plant-like polyps, which rooted to the sea floor, facilitate budding, and the final release of offspring
E) jellyfish are either male or female, and through the release of sperm and eggs into the open water, perform fertilisation

OE:
This is a Conclusion Weakening question:
Premise A: a chemical has been developed that makes it difficult for some sea creatures to reproduce by causing problems during the later reproductive stages
+
Premise B: when the chemical is placed in the sea, it spreads outwards and downwards and is effective at a depth of up to 20 feet
=
Inventors' Conclusion: the chemical will be effective in controlling jellyfish numberWeakening Data: ?

Answer choice (D) weakens inventors' conclusion and therefore logically completes argument.
If after fertilization, the reproductive process of jellyfish takes place on the sea floor, then the chemical, which is only active in the top 20 feet of the ocean, will not be capable of affecting the reproduction in any way.

The question says that the chemical reaches to depth of 20 feet, but still unable to control jellyfish. Why?

What if the jellyfish develop at the level that is between ground and 19.9 feet above the ground. Keeping this in mind, I looked at the solution.

A) such an invention will most likely be implemented by groups looking to reinstate balance in ecosystems that have been damaged. How does it matter to us?
B) the vertical order of a mixture of different liquids is determined by the relative density of each individual liquid. How does it matter to us?
C) the planula, a pre-embryonic creature spawned from a jellyfish pair, may swim freely in the ocean for several days before reaching its destination on the sea bottom. We don't know the depth at which they swim and if the chemical reaches to them or not.
D) shortly after fertilization, jellyfish larvae become plant-like polyps, which rooted to the sea floor, facilitate budding, and the final release of offspring. So the embryo development happen at the sea level where chemical does'nt reach. And, hence it would not be able to control jelly fishes.
E) jellyfish are either male or female, and through the release of sperm and eggs into the open water, perform fertilisation. we are not concerned about fertilization process.
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Senior Manager
Joined: 07 Sep 2014
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Concentration: Finance, Marketing
Re: A chemical compound has been developed that disrupts the [#permalink]

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11 Aug 2016, 23:31
goodyear2013 wrote:
Which of the following most logically completes the argument?

A chemical compound has been developed that disrupts the biological messages responsible for the later stages of embryonic development during the reproduction cycles of certain sea creatures. Upon introduction into an area of the ocean, the compound spreads outwards and downwards, reaching an active depth of up to 20 feet. The inventors of the compound are aiming primarily at offering it as a method for controlling the numbers of jellyfish although this will clearly be unsuccessful since __________.

A) such an invention will most likely be implemented by groups looking to reinstate balance in ecosystems that have been damaged
B) the vertical order of a mixture of different liquids is determined by the relative density of each individual liquid
C) the planula, a pre-embryonic creature spawned from a jellyfish pair, may swim freely in the ocean for several days before reaching its destination on the sea bottom
D) shortly after fertilization, jellyfish larvae become plant-like polyps, which rooted to the sea floor, facilitate budding, and the final release of offspring
E) jellyfish are either male or female, and through the release of sperm and eggs into the open water, perform fertilisation

OE:
This is a Conclusion Weakening question:
Premise A: a chemical has been developed that makes it difficult for some sea creatures to reproduce by causing problems during the later reproductive stages
+
Premise B: when the chemical is placed in the sea, it spreads outwards and downwards and is effective at a depth of up to 20 feet
=
Inventors' Conclusion: the chemical will be effective in controlling jellyfish numberWeakening Data: ?

Answer choice (D) weakens inventors' conclusion and therefore logically completes argument.
If after fertilization, the reproductive process of jellyfish takes place on the sea floor, then the chemical, which is only active in the top 20 feet of the ocean, will not be capable of affecting the reproduction in any way.

Although D is the best among all, I have to assume that depth of sea is more than 20 feet. Although it's common sense that depth would be greater than that but I believe that it should be mentioned in the premise itself somehow.
SVP
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Posts: 1896
Location: United States
GMAT 1: 700 Q49 V33
GPA: 3.64
Re: A chemical compound has been developed that disrupts the [#permalink]

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16 Jul 2017, 03:06
OMG, how a real gmat question is so ambiguous and unclear, look at the conclusion, "although this although this will clearly be unsuccessful since...." => since modifies words next to it only???
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A chemical compound has been developed that disrupts the [#permalink]

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16 Jul 2017, 03:59
I did not understand the answer D
In option D what phase of fertilization is D talking about .If it is in later stage then embryos are going to die .
If its in the early phase , embryos will survive.
Experts Any thoughts on this ?

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Re: A chemical compound has been developed that disrupts the [#permalink]

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16 Aug 2017, 16:04
goodyear2013 wrote:
Which of the following most logically completes the argument?

A chemical compound has been developed that disrupts the biological messages responsible for the later stages of embryonic development during the reproduction cycles of certain sea creatures. Upon introduction into an area of the ocean, the compound spreads outwards and downwards, reaching an active depth of up to 20 feet. The inventors of the compound are aiming primarily at offering it as a method for controlling the numbers of jellyfish although this will clearly be unsuccessful since __________.

A) such an invention will most likely be implemented by groups looking to reinstate balance in ecosystems that have been damaged
B) the vertical order of a mixture of different liquids is determined by the relative density of each individual liquid
C) the planula, a pre-embryonic creature spawned from a jellyfish pair, may swim freely in the ocean for several days before reaching its destination on the sea bottom
D) shortly after fertilization, jellyfish larvae become plant-like polyps, which rooted to the sea floor, facilitate budding, and the final release of offspringYes
E) jellyfish are either male or female, and through the release of sperm and eggs into the open water, perform fertilisation

OE:
This is a Conclusion Weakening question:
Premise A: a chemical has been developed that makes it difficult for some sea creatures to reproduce by causing problems during the later reproductive stages
+
Premise B: when the chemical is placed in the sea, it spreads outwards and downwards and is effective at a depth of up to 20 feet
=
Inventors' Conclusion: the chemical will be effective in controlling jellyfish numberWeakening Data: ?

Answer choice (D) weakens inventors' conclusion and therefore logically completes argument.
If after fertilization, the reproductive process of jellyfish takes place on the sea floor, then the chemical, which is only active in the top 20 feet of the ocean, will not be capable of affecting the reproduction in any way.

When this question asks what answer choice most logically completes the passage, it is really asking what answer choice supports the fact that the chemical compound will NOT kill jellyfish. Question D simply detracts from the efficacy of the plan by showing that many infant jellyfish would be unharmed by the chemical as the chemical only penetrates 20 feet deep into the sea.
Re: A chemical compound has been developed that disrupts the   [#permalink] 16 Aug 2017, 16:04
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