The Origin of Species by Means of Natural Selection,: Or the Preservation of Favoured Races in the Struggle for LifeJohn Murray, Albemarle Street., 1891 - 432ÆäÀÌÁö |
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... closely , but unequally , related to each other , and in having restricted ranges 30 CHAPTER III . STRUGGLE FOR EXISTENCE . Its bearing on natural selection - The term used in a wide sense - Geometrical ratio of increase - Rapid ...
... closely , but unequally , related to each other , and in having restricted ranges 30 CHAPTER III . STRUGGLE FOR EXISTENCE . Its bearing on natural selection - The term used in a wide sense - Geometrical ratio of increase - Rapid ...
11 ÆäÀÌÁö
... closely allied species , we generally perceive in each domestic race , as already remarked , less uniformity of character than in true species . Domestic races often have a somewhat monstrous character ; by which I mean , that ...
... closely allied species , we generally perceive in each domestic race , as already remarked , less uniformity of character than in true species . Domestic races often have a somewhat monstrous character ; by which I mean , that ...
12 ÆäÀÌÁö
... closely allied natural species - for instance , of the many foxes - inhabiting different quarters of the world . I do not believe , as we shall presently see , that the whole amount of difference between the several breeds of the dog ...
... closely allied natural species - for instance , of the many foxes - inhabiting different quarters of the world . I do not believe , as we shall presently see , that the whole amount of difference between the several breeds of the dog ...
18 ÆäÀÌÁö
... closely related to each other . But to extend it so far as to suppose that species , aboriginally as distinct as carriers , tumblers , pouters , and fantails now are , should yield offspring perfectly fertile inter se , would be rash in ...
... closely related to each other . But to extend it so far as to suppose that species , aboriginally as distinct as carriers , tumblers , pouters , and fantails now are , should yield offspring perfectly fertile inter se , would be rash in ...
22 ÆäÀÌÁö
... closely allied sub - breeds . And when a cross has been made , the closest selection is far more indispensable even than in ordinary cases . If selection consisted merely in sepa- rating some very distinct variety , and breeding from it ...
... closely allied sub - breeds . And when a cross has been made , the closest selection is far more indispensable even than in ordinary cases . If selection consisted merely in sepa- rating some very distinct variety , and breeding from it ...
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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 lamell©¡ larv©¡ 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