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The excerpt represents the core issue or deciding factor on which you must meditate, and is drawn from The Voyage of the Beagle by Charles Darwin: wood for our fire, we kept ourselves warm.
28th. -- We continued gradually ascending, and the valley
now changed into a ravine. During the day we saw several
guanacos, and the track of the closely-allied species, the
Vicuna: this latter animal is pre-eminently alpine in its
habits; it seldom descends much below the limit of perpetual
snow, and therefore haunts even a more lofty and sterile
situation than the guanaco. The only other animal which we
saw in any number was a small fox: I suppose this animal
preys on the mice and other small rodents, which, as long as
there is the least vegetation, subsist in considerable numbers
 The Voyage of the Beagle |