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 45
Or, The Preservation of Favoured Races in the Struggle for Life Charles Darwin. Chapter Three STRUGGLE FOR EXISTENCE BEFORE ENTERING ON the subject of this chapter , I must make a few Its bearing on preliminary remarks , to show how the ...
Or, The Preservation of Favoured Races in the Struggle for Life Charles Darwin. Chapter Three STRUGGLE FOR EXISTENCE BEFORE ENTERING ON the subject of this chapter , I must make a few Its bearing on preliminary remarks , to show how the ...
Página 103
Or, The Preservation of Favoured Races in the Struggle for Life Charles Darwin. But if variations useful to any organic being ever do occur , assuredly individuals thus characterised will have the best chance of being preserved in the ...
Or, The Preservation of Favoured Races in the Struggle for Life Charles Darwin. But if variations useful to any organic being ever do occur , assuredly individuals thus characterised will have the best chance of being preserved in the ...
Página 427
... struggle will often be severe between beings remote in the scale of nature . The slightest advantage in certain individuals , at any age or during any season , over those with which they come into competition , or better adaptation in ...
... struggle will often be severe between beings remote in the scale of nature . The slightest advantage in certain individuals , at any age or during any season , over those with which they come into competition , or better adaptation in ...
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