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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: a scale of one plant over the aborigines. As I have already
said, I nowhere saw the cardoon south of the Salado; but
it is probable that in proportion as that country becomes
inhabited, the cardoon will extend its limits. The case is
different with the giant thistle (with variegated leaves) of
the Pampas, for I met with it in the valley of the Sauce.
According to the principles so well laid down by Mr. Lyell,
few countries have undergone more remarkable changes,
since the year 1535, when the first colonist of La Plata landed
with seventy-two horses. The countless herds of horses,
cattle, and sheep, not only have altered the whole aspect of
 The Voyage of the Beagle |