The Advancement of Science: Occasional Essays & AddressesMacmillan, 1890 - 387 |
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Strona 12
... selected by the breeder for propagation , and so on through several generations . In the end a very short - horned generation would be obtained , differ- ing greatly in appearance from the cattle with which the 12 I DEGENERATION :
... selected by the breeder for propagation , and so on through several generations . In the end a very short - horned generation would be obtained , differ- ing greatly in appearance from the cattle with which the 12 I DEGENERATION :
Strona 13
... selection exercised by the breeder . The question arises , then , " Is there any necessary selective process in nature which could have operated through untold ages , and so have represented the selective action of the breeder , during ...
... selection exercised by the breeder . The question arises , then , " Is there any necessary selective process in nature which could have operated through untold ages , and so have represented the selective action of the breeder , during ...
Strona 14
... selection . So , too , with natural selection in the struggle for existence ; the fact that all the young born of one species are not exactly alike but some larger , some smaller , some lighter , some darker , some short - legged , some ...
... selection . So , too , with natural selection in the struggle for existence ; the fact that all the young born of one species are not exactly alike but some larger , some smaller , some lighter , some darker , some short - legged , some ...
Strona 15
... selection of the fittest , led to the production , from shapeless primitive living matter , of all the end- less varieties of complicated plants and animals which now people the world . Countless varieties have died out , leaving only ...
... selection of the fittest , led to the production , from shapeless primitive living matter , of all the end- less varieties of complicated plants and animals which now people the world . Countless varieties have died out , leaving only ...
Strona 16
... kind of organisation ( especially where a num- ber of elaborate details of structure are involved ) has not been twice produced by natural selection . Thus we are entitled to conclude that all the animals which 16 I DEGENERATION :
... kind of organisation ( especially where a num- ber of elaborate details of structure are involved ) has not been twice produced by natural selection . Thus we are entitled to conclude that all the animals which 16 I DEGENERATION :
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