The Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeJ. Murray, 1920 - 432페이지 |
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... genera -Many of the species of the larger genera resemble varieties in being very closely , but unequally , related to each other , and in having restricted ranges 30 CHAPTER III . STRUGGLE FOR EXISTENCE . Its bearing on natural ...
... genera -Many of the species of the larger genera resemble varieties in being very closely , but unequally , related to each other , and in having restricted ranges 30 CHAPTER III . STRUGGLE FOR EXISTENCE . Its bearing on natural ...
4 페이지
... genera are lineal descendants of some other and generally extinct species , in the same manner as the acknowledged varieties of any one species are the descendants of that species . Furthermore , I am convinced that Natural Selection ...
... genera are lineal descendants of some other and generally extinct species , in the same manner as the acknowledged varieties of any one species are the descendants of that species . Furthermore , I am convinced that Natural Selection ...
6 페이지
... genera- tions are modified in the same manner . It is extremely difficult to come to any conclusion in regard to the extent of the changes which have been thus definitely induced . There can , however , be little doubt about many slight ...
... genera- tions are modified in the same manner . It is extremely difficult to come to any conclusion in regard to the extent of the changes which have been thus definitely induced . There can , however , be little doubt about many slight ...
12 페이지
... genera originate under nature , it will be seen that we have no right to expect often to find a generic amount of difference in our domesticated races . In attempting to estimate the amount of structural difference between allied ...
... genera originate under nature , it will be seen that we have no right to expect often to find a generic amount of difference in our domesticated races . In attempting to estimate the amount of structural difference between allied ...
29 페이지
... genera . Isidore Geoffroy St. Hilaire has proved this in regard to size , and so it is with colour and probably with the length of hair . With respect to fleetness , which depends on many bodily characters , Eclipse was far fleeter ...
... genera . Isidore Geoffroy St. Hilaire has proved this in regard to size , and so it is with colour and probably with the length of hair . With respect to fleetness , which depends on many bodily characters , Eclipse was far fleeter ...
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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 fact 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 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