The Origin of Species by Means of Natural Selection: Or the Preservation of Favored Races in the Struggle for LifeD. Appleton, 1904 - 435 páginas |
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Página 97
... descendants from a common parent - Ex- plains the grouping of all organic beings - Advance in organ- isation - Low forms preserved - Convergence of character- Indefinite multiplication of species - Summary . How will the struggle for ...
... descendants from a common parent - Ex- plains the grouping of all organic beings - Advance in organ- isation - Low forms preserved - Convergence of character- Indefinite multiplication of species - Summary . How will the struggle for ...
Página 133
... descendants of the commoner species . From these several considerations I think it inevitably follows , that as new species in the course of time are formed through natural selection , others will become . rarer CHAP . IV . ] EXTINCTION ...
... descendants of the commoner species . From these several considerations I think it inevitably follows , that as new species in the course of time are formed through natural selection , others will become . rarer CHAP . IV . ] EXTINCTION ...
Página 136
... descendants from any one species become in structure , constitution , and habits , by so much will they be better enabled to seize on many and widely diver- sified places in the polity of nature , and so be enabled to increase in ...
... descendants from any one species become in structure , constitution , and habits , by so much will they be better enabled to seize on many and widely diver- sified places in the polity of nature , and so be enabled to increase in ...
Página 137
... descendants seizing on places at present occupied by other animals : some of them , for instance , being enabled to feed on new kinds of prey , either dead or alive ; some inhabiting new stations , climbing trees , frequenting water ...
... descendants seizing on places at present occupied by other animals : some of them , for instance , being enabled to feed on new kinds of prey , either dead or alive ; some inhabiting new stations , climbing trees , frequenting water ...
Página 140
... Descendants of a Common Ancestor . After the foregoing discussion , which has been much compressed , we may assume that the modified descend- ants of any one species will succeed so much the better as they become more diversified in ...
... Descendants of a Common Ancestor . After the foregoing discussion , which has been much compressed , we may assume that the modified descend- ants of any one species will succeed so much the better as they become more diversified in ...
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Términos y frases comunes
adapted affinities allied species America ancient appear Asa Gray beak become bees believe belonging birds breeds cause cells characters climate closely allied colour common continent crossed crustaceans degree developed difficulty distinct species domestic doubt effects eggs embryo existing extinct extremely facts favourable fertilised fertility flowers formation forms fossil Fritz Müller genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hybrids important individuals inhabitants inherited insects instance instincts intercrossing intermediate kind lamellæ larvæ less living males mammals manner marsupials migration modified descendants natural selection naturalists nearly nest occasionally offspring organisation organs parent peculiar perfect pigeon pistil pollen present principle probably produced progenitor quadrupeds ranked remarked resemblance rudimentary seeds sexual selection Silurian slight South America stamens sterility structure successive supposed swimbladder tend theory tion trees variability variations varieties vary whilst whole wings young