LSAT CR Test 28 #18

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LSAT CR Test 28 #18

by iwill » Sat Aug 29, 2009 2:15 am
Am totally confused with this q.. please discuss

A stingray without parasites is healthier than it would be if it had parasites. Nevertheless, the lack of parasites in stingrays is an indicator that the ecosystem in which the stingrays live is under environmental stress such as pollution.
Which one of the following, if true, most helps to reconcile the discrepancy indicated above?
(A) During part of their life cycles, the parasites of stingrays require as hosts shrimp or oysters, which are environmentally vulnerable organisms.
(B) A stingray is a free-ranging predator that feeds on smaller organisms but has few predators itself.
(C) A parasite drains part of the vitality of its host by drawing nourishment from the host.
(D) An ecosystem can be considered stressed if only a few species of very simple organisms can live there.
(E) Since the life of parasites depends on that of their host, they need to live without killing their host or else to reproduce and infect other individuals before their own host dies.

OA: A

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V

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IMO

by enniguy » Sun Aug 30, 2009 1:13 am
I boiled down to A simply because parasites of stingray needs oysters and other creatures which must be absent because parasites themselves are absent. There could be other reasons for parasites to disappear but to "reconcile" the discrepancy, option A suits best.

B,C,E are not even contenders.

D - Makes a general statement about ecosystem but it does not touch upon the specific details presented here.

Lastly, I did not find this question to be very good as it is still very hard to spot the discrepancy in the first place!

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by gmatmachoman » Sun Aug 30, 2009 3:53 am
I cant understand the question. If OA wuld have not been posted, its tuf to understand wat the CR means!!!