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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... namely , intercrossing , isolation , number of individuals - Slow action - Extinction caused by Natural Selection- Divergence of Character , related to the diversity of inhabitants of any small area , and to naturalisation - Action of ...
... namely , intercrossing , isolation , number of individuals - Slow action - Extinction caused by Natural Selection- Divergence of Character , related to the diversity of inhabitants of any small area , and to naturalisation - Action of ...
3 ÆäÀÌÁö
... namely , first , the difficulties of transitions , or how a simple being or a simple organ can be changed and perfected into a highly developed being or into an elaborately con- structed organ ; secondly , the subject of Instinct , or ...
... namely , first , the difficulties of transitions , or how a simple being or a simple organ can be changed and perfected into a highly developed being or into an elaborately con- structed organ ; secondly , the subject of Instinct , or ...
4 ÆäÀÌÁö
... namely , that each species has been independently created - is erroneous . I am fully convinced that species are not immutable ; but that those belonging to what are called the same genera are lineal descendants of some other and ...
... namely , that each species has been independently created - is erroneous . I am fully convinced that species are not immutable ; but that those belonging to what are called the same genera are lineal descendants of some other and ...
5 ÆäÀÌÁö
... case , as Professor Weismann has lately insisted , and as I have incidentally shown in my work on Variation under Domestication , ' there are two factors : namely , the nature of the organism ,. CHAP . I. ] VARIATION UNDER DOMESTICATION .
... case , as Professor Weismann has lately insisted , and as I have incidentally shown in my work on Variation under Domestication , ' there are two factors : namely , the nature of the organism ,. CHAP . I. ] VARIATION UNDER DOMESTICATION .
6 ÆäÀÌÁö
... namely , the nature of the organism , and the nature of the conditions . The former seems to be much the more important ; for nearly similar variations sometimes arise under , as far as we can judge , dissimilar conditions ; and , on ...
... namely , the nature of the organism , and the nature of the conditions . The former seems to be much the more important ; for nearly similar variations sometimes arise under , as far as we can judge , dissimilar conditions ; and , on ...
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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