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 58
... advantage over a different set of competitors or enemies . It is good thus to try in imagination to give to any one species an advantage over another . Probably in no single instance should we know what to do . This ought to convince us ...
... advantage over a different set of competitors or enemies . It is good thus to try in imagination to give to any one species an advantage over another . Probably in no single instance should we know what to do . This ought to convince us ...
Página 98
... advantage to each being ; and hence the accumulation of variations tending towards specialisation is within the ... advantage of such variations as arise and are beneficial to each creature under its complex relations of life . And it ...
... advantage to each being ; and hence the accumulation of variations tending towards specialisation is within the ... advantage of such variations as arise and are beneficial to each creature under its complex relations of life . And it ...
Página 183
... advantage to the nascent giraffe . Nor must we overlook the fact , that increased bulk would act as a protection ... advantage , but by the union of all , great and small . Mr. Mivart then asks ( and this is his second objection ) , if ...
... advantage to the nascent giraffe . Nor must we overlook the fact , that increased bulk would act as a protection ... advantage , but by the union of all , great and small . Mr. Mivart then asks ( and this is his second objection ) , if ...
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