PrepTest 130, Section 4, Question 13
Adult frogs are vulnerable to dehydration because of(63 more words not shown)
The information above most strongly(13 more words not shown)
- ALarge adult frogs(10 more words not shown)
- BFrogs living in(12 more words not shown)
- CLarge adult frogs(12 more words not shown)
- DFewer small adult(10 more words not shown)
- ESmall adult frogs(14 more words not shown)
Reading the argument
Permeable skin lets water pass through it. That makes dehydration a problem for these frogs. Small adult frogs have relatively little body weight compared with the area of skin through which they can lose moisture, and the passage tells us that they cannot survive in arid climates.
Now put that restriction on the map. The Yucatán is arid in the north and wet in the south. Small adult frogs face a survival problem in the north. Large adult frogs do not have the same stated restriction.
What we’re looking for
Be careful not to turn that into “large frogs in the north, small frogs in the south” as though each size were confined to its own half. Nothing excludes large frogs from the wet south. For the most-supported conclusion, carry over the distinction about conditions the frogs can tolerate, not a count of how many frogs actually occupy each region.
Working the answers
- A
Nothing says that large and small frogs cannot live together in wet areas. Moisture requirements might permit both sizes there. A adds an incompatibility between the animals that the passage does not describe.
- B
We do not have the numbers or weights needed to compare average weight across the two regions. Wet areas could contain both small and large frogs. Although the dry climate excludes small adult frogs, that does not establish the specific average-weight comparison B makes.
- CCorrect
Large adult frogs can tolerate the arid conditions that exclude small adult frogs, while nothing gives them a corresponding restriction against wet conditions. Since moisture is the most important factor determining habitat here, large adults can live in more of the peninsula. This is a claim about possible habitat, not a claim that every large frog lives everywhere.
- D
The passage concerns where frogs can survive, not how many frogs of each size live in the south. A broad possible range for large frogs does not establish that they outnumber small frogs in the wet region.
- E
We are given no regional comparison of skin permeability. In fact, the arid north presents the stated survival problem for small adult frogs. E assumes a northern group and a difference in its skin that the passage never supplies.
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