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 137
... continuous , that it has been continuous during a long period . Geology would lead us to believe that most continents have been broken up into islands even during the later tertiary periods ; and in such islands distinct species might ...
... continuous , that it has been continuous during a long period . Geology would lead us to believe that most continents have been broken up into islands even during the later tertiary periods ; and in such islands distinct species might ...
Página 344
... continuous land from western Europe , through Siberia , to eastern America . And this continuity of the circumpolar land , with the consequent freedom under a more favourable climate for intermigration , will account for the supposed ...
... continuous land from western Europe , through Siberia , to eastern America . And this continuity of the circumpolar land , with the consequent freedom under a more favourable climate for intermigration , will account for the supposed ...
Página 370
... continuous land , yet they are inhabited by a vast number of distinct mammals , birds , and plants ; so it is , according to Mr. Bates , with the butterflies and other animals inhabiting the great , open , and continuous valley of the ...
... continuous land , yet they are inhabited by a vast number of distinct mammals , birds , and plants ; so it is , according to Mr. Bates , with the butterflies and other animals inhabiting the great , open , and continuous valley of the ...
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