The Origin of Species by Means of Natural Selection: Or, the Preservation of Favored Races in the Struggle for Life, 1권Hurst, 1890 - 501페이지 |
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141 페이지
... seems to re- sult from their uselessness , and consequently from natural selection having had no power to check deviations in their structure . A PART DEVELOPED IN ANY SPECIES IN AN EXTRAORDI- NARY DEGREE OR MANNER , IN COMPARISON WITH ...
... seems to re- sult from their uselessness , and consequently from natural selection having had no power to check deviations in their structure . A PART DEVELOPED IN ANY SPECIES IN AN EXTRAORDI- NARY DEGREE OR MANNER , IN COMPARISON WITH ...
170 페이지
... seems to me only re- stating the fact in dignified language . He who believes in the struggle for existence and in the principle of natural selection , will acknowledge that every organic being is con- stantly endeavoring to increase in ...
... seems to me only re- stating the fact in dignified language . He who believes in the struggle for existence and in the principle of natural selection , will acknowledge that every organic being is con- stantly endeavoring to increase in ...
489 페이지
... seem to have produced some direct and definite effect , but how much we cannot say . Thus , when varieties enter any ... seems to have played an important part , so that when one part has been modified other parts have been necessarially ...
... seem to have produced some direct and definite effect , but how much we cannot say . Thus , when varieties enter any ... seems to have played an important part , so that when one part has been modified other parts have been necessarially ...
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adapted admit affinities allied species America ancient appear Asa Gray beak become bees believe belonging birds breeds cause cells characters climate closely allied color continued crossed crustaceans degree developed difficulty distinct species domestic doubt effects eggs embryo existing extinct extremely facts favorable females fertility flowers formation forms fossil Fritz Müller genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hybrids hybrids produced important individuals inhabitants inherited insects instance instincts intercrossing intermediate intervals kind lamellæ larvæ less living male mammals manner marsupials migration modified descendants natural selection naturalists nearly nest oceanic islands offspring organs parent peculiar perfect pigeons pistil pollen present principle probably produced quadrupeds ranked remarked resemblance rudimentary seeds sexual selection Silurian slight South America stamens sterility structure successive suppose tend theory tion trees variability variations varieties vary whole widely different wings young