Discussion

Explanation:

Option 1 is incorrect. One can conclude from the passage that snow depth and snow density both influence the stability of the subnivium. Therefore the option is not an exception to what is true. Eliminate option 1. Option 2 is an exception to what is true, based on the passage. We cannot conclude from the passage that climate change has some positive effects on the subnivium. Climate change is said to adversely affect the subnivium by changing the duration of snowfall. The passage does not state any instance of how climate change may have some positive effects on the subnivium. Therefore, retain option 2.
Option 3 is incorrect. It is clearly stated in the passage that the subnivium’s temperature holds steady at around 32°F (0°C). Eliminate option 3.
Option 4 is incorrect. The passage mentions that researchers removed a portion of the snow cover to investigate the importance of the subnivium’s insulation. Eliminate option 4.
Hence, the correct answer is option 2.

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