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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: how this is, one immediately replies that it is determined by
some slight difference, in climate, food, or the number of
enemies: yet how rarely, if ever, we can point out the precise
cause and manner of action of the check! We are
therefore, driven to the conclusion, that causes generally
quite inappreciable by us, determine whether a given species
shall be abundant or scanty in numbers.
In the cases where we can trace the extinction of a
species through man, either wholly or in one limited district,
we know that it becomes rarer and rarer, and is then lost:
it would be difficult to point out any just distinction [13]
The Voyage of the Beagle |
