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 136
... parent and all the transitional varieties will generally have been exterminated by the very process of the formation ... parent ; and during the process of modification , each has become adapted to the conditions of life of its own ...
... parent and all the transitional varieties will generally have been exterminated by the very process of the formation ... parent ; and during the process of modification , each has become adapted to the conditions of life of its own ...
Página 273
... parent . The common parent will have had in its whole organisation much general resemblance to the tapir and to the horse ; but in some points of structure may have differed considerably from both , even perhaps more than they differ ...
... parent . The common parent will have had in its whole organisation much general resemblance to the tapir and to the horse ; but in some points of structure may have differed considerably from both , even perhaps more than they differ ...
Página 405
... parents . I have stated in the first chapter , that at whatever age a variation first appears in the parent , it tends to re - appear at a corresponding age in the offspring . Certain variations can only appear at corresponding ages ...
... parents . I have stated in the first chapter , that at whatever age a variation first appears in the parent , it tends to re - appear at a corresponding age in the offspring . Certain variations can only appear at corresponding ages ...
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