On the Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeEaston Press, 1976 - 470 páginas |
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Página 61
... inhabitants of each country are bound together , that any change in the numerical propor- tions of the inhabitants , independently of the change of climate itself , would seriously affect the others . If the country were open on its ...
... inhabitants of each country are bound together , that any change in the numerical propor- tions of the inhabitants , independently of the change of climate itself , would seriously affect the others . If the country were open on its ...
Página 82
... inhabitants will have been numerous in individuals and kinds , and will have been subjected to severe competition . When converted by subsidence into large separate islands , there will still have existed many individuals of the same ...
... inhabitants will have been numerous in individuals and kinds , and will have been subjected to severe competition . When converted by subsidence into large separate islands , there will still have existed many individuals of the same ...
Página 112
... inhabitants of that continent , and in those of Europe to the inhabitants of the European continent . And this is the case with some of the American cave - animals , as I hear from Professor Dana ; and some of the European cave ...
... inhabitants of that continent , and in those of Europe to the inhabitants of the European continent . And this is the case with some of the American cave - animals , as I hear from Professor Dana ; and some of the European cave ...
Contenido
VARIATION UNDER NATURE | 30 |
STRUGGLE FOR EXISTENCE | 45 |
NATURAL SELECTION | 59 |
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Términos y frases comunes
accumulated adapted admit affinities allied species America ancient appear beak become bees believe belonging birds breeds cause cells characters climate closely allied colour common progenitor continuous crossed crustaceans degree developed difficulty distinct species divergence doubt effects eggs embryo existing exterminated extinct extremely facts favourable fertilised fertility flowers formation forms fossil Fritz Müller genera genus geological geological period gradations greater number groups of species habits Hence hybrids hybrids produced important increase individuals inhabitants inherited insects instance instincts intercrossing intermediate kind lamellæ larvæ less living male mammals manner marsupials migration modified descendants natural selection naturalists nearly nest occasionally offspring organisation organs Origin of Species parent peculiar perfect pigeons pistil plants pollen present preserved principle probably produced quadrupeds ranked reciprocal crosses remarked resemblance rudimentary seeds slight South America stamens sterility structure struggle successive supposed swimbladder theory variability variations varieties vary whilst whole wings young