The golden toad of Costa Rica, whose beauty and rarity inspired an unu

This strikes my as a type of answer that would most often be correct: if amphibians did not have permeable skin, then they could not act as biological harbingers (7d). Because it stood out to me, I jumped the gun and did not see the better alternative, a. Am i correct in thinking that this sort of choice would most often be the correct answer? Thank you!!

Hey HansJK, I made the same mistake as you. I hardly spent 20 seconds on the question and picked D. However, I now realise why D is wrong and it has nothing to do with option A. See if my this helps -

Having permeable skin makes the bio harbingers, but is that the only feature that would make something a bio harbinger? We can't say for sure. It's just one of the features that makes a specie a bio harbinger. There may or may not be more features that do so. If a similar question came up in CR, I would have definitely ruled out D for assuming that permeable skin is the only feature that makes a specie a bio harbinger.

The skill set needed for each of the 3 verbal sections definitely overlaps and more evidently so in the 700 level questions. I hope I can realise this more often than not.

I could get only 5/8 correct. Time taken 15min(approx.)

5. The primary purpose of the passage is to

(A) discuss the mysterious disappearance of Costa Rica’s golden toad.

(B) explain why human activity is undoubtedly to blame for the global decline of amphibious populations

(C) convince humans that they must minimize the global output of pollutants.

(D) describe the recent global decline of amphibious populations and hypothesize about its causes.

(E) urge humans to pay careful attention to important environmental changes.

Is the usage of word 'recent' in option D correct as the decline was observed in 1972 itself?

Can you please explain q8

Read it here

https://gmatclub.com/forum/the-golden-t ... l#p2294779

Cheers