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Raamatud Books 11 - 11 of 11 on ... species will present various degrees of capacity for ensuring the means of preserving....
" ... species will present various degrees of capacity for ensuring the means of preserving life; and it is thus we account for the abundance or rarity of species. Our ignorance will generally prevent us from accurately tracing the effects to their causes;... "
Contributions to the Theory of Natural Selection: A Series of Essays - Page 40
by Alfred Russel Wallace - 1871 - 384 lehte
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On the Origin of Species

Charles Darwin - 2003 - 672 lehte
...from accurately tracing the effects to their causes; but could we become perfectly acquainted with the organization and habits of the various species of...If now we have succeeded in establishing these two points — ist, that the animal population of a country is generally stationary, being kept down by...
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