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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6 ÆäÀÌÁö
... 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 changes , -such as size from the amount of food ...
... 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 changes , -such as size from the amount of food ...
23 ÆäÀÌÁö
... extremely alike the flowers ; how unlike the flowers of the heartsease are , and how alike the leaves ; how much the fruit of the different kinds of gooseberries differ in size , colour , shape , and hairiness , and yet the flowers ...
... extremely alike the flowers ; how unlike the flowers of the heartsease are , and how alike the leaves ; how much the fruit of the different kinds of gooseberries differ in size , colour , shape , and hairiness , and yet the flowers ...
27 ÆäÀÌÁö
... extremely small differences , and it is in human nature to fancy any novelty , however slight , in one's own possession . Nor must the value which would formerly have been set on any slight differences in the individuals of the same ...
... extremely small differences , and it is in human nature to fancy any novelty , however slight , in one's own possession . Nor must the value which would formerly have been set on any slight differences in the individuals of the same ...
32 ÆäÀÌÁö
... extremely perplexing : I refer to those genera which have been called " protean " or " polymorphic , " in which the species present an inordinate amount of variation . With respect to many of these forms , hardly two naturalists agree ...
... extremely perplexing : I refer to those genera which have been called " protean " or " polymorphic , " in which the species present an inordinate amount of variation . With respect to many of these forms , hardly two naturalists agree ...
48 ÆäÀÌÁö
... extremely few , is , that the slow - breeders would require a few more years to people , under favourable conditions , a whole district , let it be ever so large . The condor lays a couple of eggs and the ostrich a score , and yet in ...
... extremely few , is , that the slow - breeders would require a few more years to people , under favourable conditions , a whole district , let it be ever so large . The condor lays a couple of eggs and the ostrich a score , and yet in ...
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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