On the Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeEaston Press, 1976 - 470 páginas |
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Página 51
... action of climate seems at first sight to be quite independent of the struggle for existence ; but in so far as climate chiefly acts in reducing food , it brings on the most severe struggle between the individuals , whether of the same ...
... action of climate seems at first sight to be quite independent of the struggle for existence ; but in so far as climate chiefly acts in reducing food , it brings on the most severe struggle between the individuals , whether of the same ...
Página 107
... action of natural selection , and how much to the definite action of the conditions of life . Thus , it is well known to furriers that animals of the same species have thicker and better fur the further north they live ; but who can ...
... action of natural selection , and how much to the definite action of the conditions of life . Thus , it is well known to furriers that animals of the same species have thicker and better fur the further north they live ; but who can ...
Página 211
... action is performed , but not necessarily of its origin . How unconsciously many habitual actions are performed , indeed not rarely in direct opposition to our conscious will ! yet they may be modified by the will or reason . Habits ...
... action is performed , but not necessarily of its origin . How unconsciously many habitual actions are performed , indeed not rarely in direct opposition to our conscious will ! yet they may be modified by the will or reason . Habits ...
Contenido
VARIATION UNDER NATURE | 30 |
STRUGGLE FOR EXISTENCE | 45 |
NATURAL SELECTION | 59 |
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Términos y frases comunes
accumulated adapted admit affinities allied species America ancient appear beak become bees believe belonging birds breeds cause cells characters climate closely allied colour common progenitor continuous crossed crustaceans degree developed difficulty distinct species divergence doubt effects eggs embryo existing exterminated extinct extremely facts favourable fertilised fertility flowers formation forms fossil Fritz Müller genera genus geological geological period gradations greater number groups of species habits Hence hybrids hybrids produced 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 offspring organisation organs Origin of Species parent peculiar perfect pigeons pistil plants pollen present preserved principle probably produced quadrupeds ranked reciprocal crosses remarked resemblance rudimentary seeds slight South America stamens sterility structure struggle successive supposed swimbladder theory variability variations varieties vary whilst whole wings young