The Origin of Species by Means of Natural Selection; Or, the Preservation of Favored Races in the Struggle for Life ...A.L. Burt, 1890 - 538페이지 |
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73 페이지
... Divergence of Character , related to the diversity of inhabitants of any small area and to naturalization - Action of Natural Selection , through Divergence of Character and Extinction , on the descendants from a common parent ...
... Divergence of Character , related to the diversity of inhabitants of any small area and to naturalization - Action of Natural Selection , through Divergence of Character and Extinction , on the descendants from a common parent ...
103 페이지
... divergence , causing differences , at first barely appreciable , steadily to increase , and the breeds to diverge in character , both from each other and from their common parent . But , how , it may be asked , can any analogous ...
... divergence , causing differences , at first barely appreciable , steadily to increase , and the breeds to diverge in character , both from each other and from their common parent . But , how , it may be asked , can any analogous ...
107 페이지
... divergence of character comes in ; for this will generally lead to the most different or divergent variations ( represented by the outer dotted lines ) being preserved and accumulated by natural selection . When a dotted line reaches ...
... divergence of character comes in ; for this will generally lead to the most different or divergent variations ( represented by the outer dotted lines ) being preserved and accumulated by natural selection . When a dotted line reaches ...
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adapted admit affinities allied species America ancient appear Asa Gray beak become bees believe belonging birds breeds cause cells characters climate closely allied color continued crossed crustaceans degree developed difficulty distinct species divergence domestic doubt effects eggs embryo existing extinct extremely facts favorable fertility flowers formation forms fossil Fritz Müller genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hybrids hybrids produced important individuals inhabitants inherited insects instance instincts intercrossing intermediate intervals kind lamellæ larvæ less living male mammals manner marsupials migration modified descendants natural selection naturalists nearly nest occasionally oceanic islands offspring organs parent peculiar perfect pigeons pistil pollen present principle probably produced quadrupeds ranked remarked resemblance rudimentary seeds sexual selection Silurian slight South America stamens sterility structure successive suppose tend theory tion variability variations varieties vary whole widely different wings young