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605-655 (Medium)|   Resolve Paradox|                     
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mayankdgmat
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I wouldn't recommend thinking about this in terms of strengthening an argument, because the text in this case isn't really an argument. The author doesn't present a conclusion, so there's nothing to strengthen or weaken. You could, however, think of B as heightening the discrepancy. If barnacles attach best in areas of weak tidal currents, then it's even more mysterious that the juveniles in these areas aren't covered in barnacles. We could think of A in similar fashion, since it seems to rule out an explanation, but it doesn't seem terribly relevant, since the areas we're wondering about don't have strong tidal currents.
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How the below two Trap answers are negated: Here is my logic

(A) Tidal currents do not themselves dislodge barnacles from the shells of horseshoe crabs.
It is actually strengthening the conclusion but not explaining why Paradox, This answer will be my choice for strengthening the argument


(B) Barnacles most readily attach themselves to horseshoe crabs in areas where tidal currents are weakest.

My paradox is not explained since what is required is why a large population of banacles are not attached to shells. Readily attached is not helping to explain the paradox.
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Physcometrically, its designed in a great way since one can get lost in finding out connection with tide however the answer was absolutely present in option E.
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Boil it down:
Cause A => Effect B
No cause A => Still, effect B
Surprising.

Resolve the paradox: maybe there is some other cause Z?

Which of the following, if true, most helps to explain the surprising finding?

(A) Tidal currents do not themselves dislodge barnacles from the shells of horseshoe crabs – Doesn’t explain what thing dislodges barnacles in areas with weak currents
(B) Barnacles most readily attach themselves to horseshoe crabs in areas where tidal currents are weakest – Against the premise
(C) The strength of the tidal currents in a given location varies widely over the course of a day – Irrelevant
(D) A very large barnacle population can significantly decrease the ability of a horseshoe crab to find food – Irrelevant
(E) Until they are fully grown, horseshoe crabs shed their shells and grow new ones several times a year – Resolves the paradox
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