The Origin of Species by Means of Natural Selection,: Or the Preservation of Favoured Races in the Struggle for LifeJohn Murray, Albemarle Street., 1891 - 432페이지 |
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vi 페이지
... SELECTION ; OR THE SURVIVAL OF THE FITTEST . Natural Selection - its power compared with man's selection - its power on characters of trifling importance - its power at all ages and on both sexes -Sexual selection - On the generality of ...
... SELECTION ; OR THE SURVIVAL OF THE FITTEST . Natural Selection - its power compared with man's selection - its power on characters of trifling importance - its power at all ages and on both sexes -Sexual selection - On the generality of ...
7 페이지
... sexual reproduction ; but this is certainly an error ; for I have given in another work a long list of " sporting plants , " as they are called by gardeners ; -that is , of plants which have suddenly produced a single bud with a new and ...
... sexual reproduction ; but this is certainly an error ; for I have given in another work a long list of " sporting plants , " as they are called by gardeners ; -that is , of plants which have suddenly produced a single bud with a new and ...
57 페이지
... SELECTION ; OR THE SURVIVAL OF THE FITTEST . Natural Selection - its power compared with man's selection - its power on characters of trifling importance - its power at all ages and on both sexes - Sexual Selection - On the generality ...
... SELECTION ; OR THE SURVIVAL OF THE FITTEST . Natural Selection - its power compared with man's selection - its power on characters of trifling importance - its power at all ages and on both sexes - Sexual Selection - On the generality ...
63 페이지
... selection ; for instance , the great jaws possessed by certain insects ... selection of all the young birds within the egg , which had the most powerful and hardest beaks ... Sexual Selection . Inasmuch as peculiarities often appear under ...
... selection ; for instance , the great jaws possessed by certain insects ... selection of all the young birds within the egg , which had the most powerful and hardest beaks ... Sexual Selection . Inasmuch as peculiarities often appear under ...
64 페이지
Or the Preservation of Favoured Races in the Struggle for Life Charles Darwin. Sexual Selection . Inasmuch as peculiarities often appear under domestication in one sex and become hereditarily attached to that sex , so ... SEXUAL SELECTION .
Or the Preservation of Favoured Races in the Struggle for Life Charles Darwin. Sexual Selection . Inasmuch as peculiarities often appear under domestication in one sex and become hereditarily attached to that sex , so ... SEXUAL SELECTION .
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accumulated adapted admit affinities allied species America analogous ancient appear beak become bees believe belonging birds breeds cause cells characters climate closely allied colour continued crossed crustaceans degree developed difficulty distinct species domestic animals doubt effects eggs embryo existing extinct extremely facts favourable female fertilised fertility flowers formation formerly forms fossil Fritz Müller genera genus geological geological period Glacial period gradations greater number habits Hence hybrids 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 occur oceanic islands offspring organisation organs parent peculiar perfect pigeon pistil pollen present preserved principle probably produced quadrupeds ranked reciprocal crosses remarked resemblance rudimentary seeds sexual selection Silurian slight South America stamens sterility structure successive supposed tend theory tion variability variations varieties vary whilst whole wings young