"Each species may have had its origin in a single pair, or individual, where an individual was sufficient, and species may have been created in success...

Amidst the vicissitudes of the earth's surface, species cannot be immortal, but must perish, one after another, like the individuals which compose them. There is no possibility of escaping from this conclusion.
Amidst the vicissitudes of the earth's surface, species cannot be immortal, but must perish, one aft...
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