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# Recent research indicates that mercury levels in the bodies

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Retired Moderator
Status: Preparing for GMAT
Joined: 25 Nov 2015
Posts: 989
Location: India
GPA: 3.64
Recent research indicates that mercury levels in the bodies  [#permalink]

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19 Dec 2017, 09:14
1
00:00

Difficulty:

35% (medium)

Question Stats:

65% (01:41) correct 35% (01:41) wrong based on 138 sessions

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Recent research indicates that mercury levels in the bodies of saltwater fish are higher now than they were a hundred years ago. Mercury from the fish accumulates in the base of the feathers of seabirds that eat saltwater fish. Feathers taken from seabirds stuffed and preserved in the 1900s were found to contain only half as much mercury as do feathers recently taken from living birds of the same species.

The argument depends on the assumption that

A) The number of sources of pollutants in 1900s was much lower than it is now.
B) The quantity of mercury found in the body of a saltwater fish depends on the amount of pollution in the ocean habitat of the fish.
C) The same techniques used today were used to stuff and preserve birds in the 1900s.
D) The process used to preserve birds in the 1900s did not substantially decrease the amount of mercury in the birds’ feathers.
E) The Proportion of saltwater fish in the diet of seabirds has remained the same since the 1900s.

Source - Crackverbal

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Intern
Joined: 17 Dec 2017
Posts: 18
Location: United States
Re: Recent research indicates that mercury levels in the bodies  [#permalink]

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19 Dec 2017, 09:55
I was between D and E.... picked E. My logic in picking E is that the proportion of fish consumption has to be the same, otherwise you cannot compare mercury in seabird diets now to diets in the 1900s. For instance, if seabirds ate far fewer fish in the 1900s but the mercury levels in fish remained the same, that would be a reasonable explanation for why we are seeing more mercury in birds now than in the 1900s. Does that make sense or am I missing something?
Intern
Joined: 10 Jul 2017
Posts: 16
Re: Recent research indicates that mercury levels in the bodies  [#permalink]

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19 Dec 2017, 11:23
ferracaj13 wrote:
I was between D and E.... picked E. My logic in picking E is that the proportion of fish consumption has to be the same, otherwise you cannot compare mercury in seabird diets now to diets in the 1900s. For instance, if seabirds ate far fewer fish in the 1900s but the mercury levels in fish remained the same, that would be a reasonable explanation for why we are seeing more mercury in birds now than in the 1900s. Does that make sense or am I missing something?

E is no where related to conclusion whether mercury levels are same or not... put ANT(assumption negation rule) in D, it gives u the assumption
Re: Recent research indicates that mercury levels in the bodies   [#permalink] 19 Dec 2017, 11:23
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