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 26
... slight , in one's own possession . Nor must the value which would formerly have been set on any slight differences in the individuals of the same species , be judged of by the value which is now set on them , after several breeds have ...
... slight , in one's own possession . Nor must the value which would formerly have been set on any slight differences in the individuals of the same species , be judged of by the value which is now set on them , after several breeds have ...
Página 259
... slight changes in the conditions of life benefit all organic beings , and on the other hand , that slight crosses , that is crosses between the males and females of the same species , which have been subjected to slightly different ...
... slight changes in the conditions of life benefit all organic beings , and on the other hand , that slight crosses , that is crosses between the males and females of the same species , which have been subjected to slightly different ...
Página 427
... slight a degree to the surrounding physical conditions , will , in the long run , turn the balance . With animals having separated sexes , there will be in most cases a struggle between the males for the possession of the females . The ...
... slight a degree to the surrounding physical conditions , will , in the long run , turn the balance . With animals having separated sexes , there will be in most cases a struggle between the males for the possession of the females . 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