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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... occur among the first few and scattered inhabitants of the middle regions of Africa , some one would be better fitted than the others to bear the diseases of the country . This race would consequently multiply , while the others would ...
... occur among the first few and scattered inhabitants of the middle regions of Africa , some one would be better fitted than the others to bear the diseases of the country . This race would consequently multiply , while the others would ...
1 ÆäÀÌÁö
... occurred to me , in 1837 , that something might perhaps be made out on this question by patiently accumulating and reflecting on all sorts of facts which could possibly have any bear- ing on it . After five years ' work I allowed myself ...
... occurred to me , in 1837 , that something might perhaps be made out on this question by patiently accumulating and reflecting on all sorts of facts which could possibly have any bear- ing on it . After five years ' work I allowed myself ...
8 ÆäÀÌÁö
... occur rarely under nature , but are far from rare under culture . As a single bud out of the many thousands , produced year after year on the same tree under uniform conditions , has been known suddenly to assume a new character ; and ...
... occur rarely under nature , but are far from rare under culture . As a single bud out of the many thousands , produced year after year on the same tree under uniform conditions , has been known suddenly to assume a new character ; and ...
17 ÆäÀÌÁö
... occur together in any other species of the whole family . Now , in every one of the domestic breeds , taking thoroughly well - bred birds , all the above marks , even to the white edging of the outer tail - feathers , sometimes concur ...
... occur together in any other species of the whole family . Now , in every one of the domestic breeds , taking thoroughly well - bred birds , all the above marks , even to the white edging of the outer tail - feathers , sometimes concur ...
31 ÆäÀÌÁö
... occur which resemble normal structures in widely different animals . Thus pigs have occasionally been born with a sort of proboscis , and if any wild species of the same genus had naturally possessed a proboscis , it might have been ...
... occur which resemble normal structures in widely different animals . Thus pigs have occasionally been born with a sort of proboscis , and if any wild species of the same genus had naturally possessed a proboscis , it might have been ...
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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