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# Biologists have noted reproductive abnormalities in fish

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Re: Biologists have noted reproductive abnormalities in fish  [#permalink]

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29 Oct 2011, 20:52
You can't rule out dioxin as a contributor to the fish recovering quickly if there isn't any dioxin in the water. The question is trying to rule out dioxin as the cause of fish recovering quickly.
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Re: Biologists have noted reproductive abnormalities in fish  [#permalink]

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31 Oct 2011, 17:06
Babzsn84 wrote:
IMO-B
C seems to strenghten the conclusion that Dioxin is not the cause.

See my explanation above. Does that make sense?
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Re: Biologists have noted reproductive abnormalities in fish  [#permalink]

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16 Dec 2011, 02:41
I got D. However, I found problem with D is that D talks about "some of the fish" not all. So, not strong as C. Am I correct? Can anyone elaborate for D?
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Re: Biologists have noted reproductive abnormalities in fish  [#permalink]

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31 Dec 2011, 22:44
C it is,using POE D which is a close contender can be removed, according to argument most fish recover well from hormonal imbalance but according to D only few fish cannot so overall it does not hamper the argument.
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Re: Biologists and paper mills  [#permalink]

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11 Jul 2013, 23:39
vjsharma25 wrote:
The argument is saying that dioxin can not be the cause for fish problem.Since dioxin doesn't decompose very easily it must be present in the water even when the mill is shutdown.But strangely fish recover.So there is some other cause to the fish problem.
So any answer choice which can show that indeed dioxin is the cause of the problem, is the right answer.

"C" says that Normal river currents quickly carry the dioxin far downstream.It means that dioxin is washed away from the fish area,thats why they recover.During normal operation of the mill,there is continuous release of dioxin in the river,thats why normal current can't carry the substantial amount of dioxin with it.So it proves that dioxin is the cause.Hence the answer.

Hi vjsharma,
I still dont get why C is the answer. It is rather strengthen the argument by saying that fishes get enough time to recover during shutdowns and since no. of shutdowns are frequent, so as recovery time for fishes, hence releasing dioxin by paper mill won't harm much to fishes.
Hope I am making sense!
Rather I would go for option A, which directly attacks on the premise or the validity of the study.
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Re: Biologists have noted reproductive abnormalities in fish  [#permalink]

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31 Jul 2014, 10:10
1
Got it right though in 5mins
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Re: Biologists have noted reproductive abnormalities in fish  [#permalink]

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20 Aug 2014, 22:37
in 2.34 for me to get right answer C. Must be because i'm a doctor))
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Biologists have noted reproductive abnormalities in fish  [#permalink]

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07 May 2015, 23:03
Conclusion : Dixon is not the cause.

the shutting down of factory => no release of pollutant including dixon ( no cause)

dixon decompose slowly = presence of dixon in water. ( no other cause present except dixon)

cause present ( dixon slowly decomposing) => No effect ( harmone level recovered to normal) : hence argument conclude that the cause is not the driver of the effect.

Option C: cause was not present ( Normal river currents carry the dioxin present in
the river far downstream in a few hours.). This fact makes Dixon the likely cause of hormonal imbalance, like other pollutants.
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Re: Biologists have noted reproductive abnormalities in fish  [#permalink]

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17 May 2015, 05:41
vjsharma25 wrote:
Biologists have noted reproductive abnormalities in fish
that are immediately downstream of paper mills. One
possible cause is dioxin, which paper mills release
daily and which can alter the concentration of
hormones in fish. However, dioxin is unlikely to be the
cause, since the fish recover normal hormone
concentrations relatively quickly during occasional mill
shutdowns and dioxin decomposes very slowly in the
environment.
Which one of the following statements, if true, most
seriously weakens the argument?
(A) Some of the studies that show that fish recover
quickly during shutdowns were funded by
paper manufacturers.
(B) The rate at which dioxin decomposes varies
depending on the conditions to which it is
exposed.
(C) Normal river currents carry the dioxin present in
the river far downstream in a few hours.
(D) Some of the fish did not recover rapidly from
the physiological changes that were induced by
the changes in hormone concentrations.
(E) The connection between hormone concentrations
and reproductive abnormalities is not
thoroughly understood.

Between B and C.
b-"the rate" is not mentioned.
C-correct
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Re: #Top150 CR: Biologists have noted reproductive abnormalities in fish  [#permalink]

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04 Dec 2015, 10:11
C according to this option the dioxin reaches downstream. So it affects the fishes there, so it's the main cause of abnormality in downstream fishes. This point goes against the argument.
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Re: #Top150 CR: Biologists have noted reproductive abnormalities in fish  [#permalink]

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04 Dec 2015, 10:59
IMO B is correct.
A direct evidence to the conclusion is: dioxin decomposes very slowly in the environment.
B goes against this evidence by saying that the rate at which dioxin decomposes varies depending on the conditions to which it is exposed.

So B weakens the argument.
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Re: Biologists have noted reproductive abnormalities in fish  [#permalink]

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19 Jun 2017, 22:27
B,D,E are out of scope. A is highly doubtful because of "some". C is truly the answer if ones are fluent in English.
The first sentence tells the fact that fishes which swim at the downstream are affected by something -> C offers an explanation that weakens the argument.
My problem in this question is I am not good at English enough to go for C.
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Re: Biologists have noted reproductive abnormalities in fish  [#permalink]

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26 Jun 2017, 10:47
Merged topics. Please, search before posting questions!
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Re: Biologists have noted reproductive abnormalities in fish  [#permalink]

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27 Jun 2017, 08:53
Wow what a question .
The answer has to be C.
It is mentioned in the passage that Dioxin decomposes very slowly.
And if the water carry Dioxin very far in the river then the fish there will be affected .
So C is the answer .
I would also like an analysis of Option A please .
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Re: Biologists have noted reproductive abnormalities in fish &nbs [#permalink] 27 Jun 2017, 08:53

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