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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94개의 결과 중 6 - 10개
6 페이지
... action of changed conditions , namely , through the reproductive system of being affected , we may infer that variability is thus induced , partly from the fact of this system being extremely sensitive to any change in the conditions ...
... action of changed conditions , namely , through the reproductive system of being affected , we may infer that variability is thus induced , partly from the fact of this system being extremely sensitive to any change in the conditions ...
11 페이지
... action of the poor soil ) , that they would , to a large extent , or even wholly , revert to the wild aboriginal stock . Whether or not the experiment would succeed , is not of great importance for our line of argument ; for by the ...
... action of the poor soil ) , that they would , to a large extent , or even wholly , revert to the wild aboriginal stock . Whether or not the experiment would succeed , is not of great importance for our line of argument ; for by the ...
20 페이지
... action of the external conditions of life , and some to habit ; but he would be a bold man who would account by such agencies for the differences between a dray- and race - horse , a greyhound and bloodhound , a carrier and tumbler ...
... action of the external conditions of life , and some to habit ; but he would be a bold man who would account by such agencies for the differences between a dray- and race - horse , a greyhound and bloodhound , a carrier and tumbler ...
30 페이지
... action of the conditions of life . Some , perhaps a great , effect may be attri- buted to the increased use or disuse of parts . The final result is thus rendered infinitely complex . In some cases the intercrossing of aboriginally ...
... action of the conditions of life . Some , perhaps a great , effect may be attri- buted to the increased use or disuse of parts . The final result is thus rendered infinitely complex . In some cases the intercrossing of aboriginally ...
39 페이지
... action of natural selection , hereafter to be explained , and to the effects of the increased use or disuse of parts . A well - marked variety may therefore be called an incipient species ; but whether this belief is justifiable must be ...
... action of natural selection , hereafter to be explained , and to the effects of the increased use or disuse of parts . A well - marked variety may therefore be called an incipient species ; but whether this belief is justifiable must be ...
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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