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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94개의 결과 중 1 - 5개
v 페이지
... Individual differences - Doubtful species - Wide ranging , much diffused , and common species , vary most - Species of the larger genera in each country vary more frequently than the species of the smaller genera ... individuals - Complex.
... Individual differences - Doubtful species - Wide ranging , much diffused , and common species , vary most - Species of the larger genera in each country vary more frequently than the species of the smaller genera ... individuals - Complex.
vi 페이지
... individuals - Complex relations of all animals and plants throughout nature - Struggle for life most severe between individuals and varieties of the same species : often severe between species of the same genus - The relation of ...
... individuals - Complex relations of all animals and plants throughout nature - Struggle for life most severe between individuals and varieties of the same species : often severe between species of the same genus - The relation of ...
3 페이지
... individuals of each species are born than can possibly survive ; and as , conse- quently , there is a frequently recurrent struggle for existence , it follows that any being , if it vary however slightly in any manner profitable to ...
... individuals of each species are born than can possibly survive ; and as , conse- quently , there is a frequently recurrent struggle for existence , it follows that any being , if it vary however slightly in any manner profitable to ...
5 페이지
... individuals of the same variety or sub- variety of our older cultivated plants and animals , one of the first points which strikes us is , that they generally differ more from each other than do the individuals of any one species or ...
... individuals of the same variety or sub- variety of our older cultivated plants and animals , one of the first points which strikes us is , that they generally differ more from each other than do the individuals of any one species or ...
6 페이지
... individuals exposed to certain conditions during several 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 ...
... individuals exposed to certain conditions during several 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 ...
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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