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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... give the plant the power of increasing in numbers , we should have to give it some advantage over its competitors , or over the animals which prey on it . On the confines of its geo- graphical range , a change of constitution with ...
... give the plant the power of increasing in numbers , we should have to give it some advantage over its competitors , or over the animals which prey on it . On the confines of its geo- graphical range , a change of constitution with ...
86 페이지
Charles Darwin. It may be worth while to give another and more complex illustration of the action of natural ... gives rise to vigorous seedlings , which consequently would have the best chance of flourishing and surviving . The plants ...
Charles Darwin. It may be worth while to give another and more complex illustration of the action of natural ... gives rise to vigorous seedlings , which consequently would have the best chance of flourishing and surviving . The plants ...
206 페이지
... give examples ; but as numerical variations are comparatively rare when the parts are few , I may mention that ... gives the fol- lowing cases : the genus Zanthoxylon belongs to a division of the Rutacea with a single ovary , but in some ...
... give examples ; but as numerical variations are comparatively rare when the parts are few , I may mention that ... gives the fol- lowing cases : the genus Zanthoxylon belongs to a division of the Rutacea with a single ovary , but in some ...
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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 domestic doubt effects eggs embryo existing extinct extremely facts favorable females fertility flowers formation forms fossil Fritz Müller genera genus geological geological period gilt top Glacial period gradations greater number groups of species habits Hence hybrids hybrids produced important 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 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