The Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeCollier Books, 1962 - 512 páginas |
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Página 78
... Increase A struggle for existence inevitably follows from the high rate at which all organic beings tend to increase . Every being , which during its natural lifetime produces several eggs or seeds , must suffer destruction during some ...
... Increase A struggle for existence inevitably follows from the high rate at which all organic beings tend to increase . Every being , which during its natural lifetime produces several eggs or seeds , must suffer destruction during some ...
Página 79
... increase of slow - breeding cattle and horses in South America , and latterly in Australia , had not been well ... increase , the result of which never fails to be surprising , simply explains their extraordinarily rapid increase and ...
... increase of slow - breeding cattle and horses in South America , and latterly in Australia , had not been well ... increase , the result of which never fails to be surprising , simply explains their extraordinarily rapid increase and ...
Página 80
... increase in number . But the real importance of a large number of eggs or seeds is to make up for much destruction at some period of life ; and this period in the great majority of cases is an early one . If an ani- mal can in any way ...
... increase in number . But the real importance of a large number of eggs or seeds is to make up for much destruction at some period of life ; and this period in the great majority of cases is an early one . If an ani- mal can in any way ...
Contenido
An Historical Sketch | 15 |
Introduction | 25 |
Variation Under Nature | 58 |
Derechos de autor | |
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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 common continent crossed crustaceans degree developed difficulty distinct species domestic doubt eggs embryo existing extinct extremely facts favourable fertilised fertility flowers formation forms fossil Fritz Müller genera genus geological Glacial period gradations greater number groups of species habits Hence hybrids 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 occasionally offspring organisation organs Origin of Species parent peculiar perfect pigeons pistil pollen present principle probably produced progenitor 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