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 8
... doubt would not so perpetually recur . It has often been stated that domestic races do not differ from each other in character of generic value . It can be shown that this statement is not correct ; but naturalists differ much in ...
... doubt would not so perpetually recur . It has often been stated that domestic races do not differ from each other in character of generic value . It can be shown that this statement is not correct ; but naturalists differ much in ...
Página 60
... doubt ( remembering that many more individuals are born than can possibly survive ) that individuals having any advantage , however slight , over others , would have the best chance of surviving and of procreating their kind ? On the ...
... doubt ( remembering that many more individuals are born than can possibly survive ) that individuals having any advantage , however slight , over others , would have the best chance of surviving and of procreating their kind ? On the ...
Página 217
... doubt that the love of man has become instinctive in the dog . All wolves , foxes , jackals , and species of the cat genus , when kept tame , are most eager to attack poultry , sheep , and pigs ; and this tendency has been found ...
... doubt that the love of man has become instinctive in the dog . All wolves , foxes , jackals , and species of the cat genus , when kept tame , are most eager to attack poultry , sheep , and pigs ; and this tendency has been found ...
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