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The excerpt represents the core issue or deciding factor on which you must meditate, and is drawn from On the Origin of Species by Charles Darwin: cultivated, and which have varied during all ages under the most different
climates and treatment, I think we are driven to conclude that this greater
variability is simply due to our domestic productions having been raised
under conditions of life not so uniform as, and somewhat different from,
those to which the parent-species have been exposed under nature. There
is, also, I think, some probability in the view propounded by Andrew
Knight, that this variability may be partly connected with excess of food.
It seems pretty clear that organic beings must be exposed during several
generations to the new conditions of life to cause any appreciable amount
of variation; and that when the organisation has once begun to vary, it
generally continues to vary for many generations. No case is on record of
On the Origin of Species |
