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Explanation:

Option 1 is correct. From the example of the shrubs, we realise that changes in density of snow has such a serious impact, and this goes to show that altering any one element has a ripple effect on all others. Retain option 1. Option 2 is incorrect. The passage makes no mention of equatorial or arid zones. Eliminate option 2.
Option 3 is incorrect.  We cannot infer anything about the warmth of two different materials with the same density. Eliminate option 3.
Option 4 is incorrect. The passage does not state anything that can lead to an understanding of the geographical extent of the impact of the subnivium’s loss. Eliminate option 4.
Hence, the correct answer is option 4.

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