The Origin of Species by Means of Natural Selection,: Or the Preservation of Favoured Races in the Struggle for LifeJohn Murray, Albemarle Street., 1891 - 432 páginas |
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Página 40
... advantages that enabled their parents to become dominant over their compatriots . In these remarks on predominance , it should be understood that reference is made only to the forms which come into competition with each other , and more ...
... advantages that enabled their parents to become dominant over their compatriots . In these remarks on predominance , it should be understood that reference is made only to the forms which come into competition with each other , and more ...
Página 56
... 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 respect to climate would clearly be an advantage to our plant ; but we have reason to ...
... 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 respect to climate would clearly be an advantage to our plant ; but we have reason to ...
Página 58
... advantage , however slight , over others , would have the best chance of surviving and of procreating their kind ? On the other hand , we may feel sure that any variation in the least degree injurious would be rigidly destroyed . This ...
... advantage , however slight , over others , would have the best chance of surviving and of procreating their kind ? On the other hand , we may feel sure that any variation in the least degree injurious would be rigidly destroyed . This ...
Página 59
... . balanced forces , extremely slight modifications in the structure or habits of one species would often give it an advantage over others ; and still further modifications of the same kind. CHAP . IV . ] 59 NATURAL SELECTION .
... . balanced forces , extremely slight modifications in the structure or habits of one species would often give it an advantage over others ; and still further modifications of the same kind. CHAP . IV . ] 59 NATURAL SELECTION .
Página 60
... advantage , as long as the species continued under the same conditions of life and profited by similar means of subsistence and defence . No country can be named in which all the native inhabitants are now so perfectly adapted to each ...
... advantage , as long as the species continued under the same conditions of life and profited by similar means of subsistence and defence . No country can be named in which all the native inhabitants are now so perfectly adapted to each ...
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Términos y frases comunes
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 lamellæ larvæ 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