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 44
... tend to become converted into new and distinct species . Thus the larger genera tend to become larger ; and throughout nature the forms of life which are now dominant tend to become still more dominant by leaving many modified and ...
... tend to become converted into new and distinct species . Thus the larger genera tend to become larger ; and throughout nature the forms of life which are now dominant tend to become still more dominant by leaving many modified and ...
Página 102
... tend generally to spread very widely ; consequently , they will tend to supplant and exterminate several species in several areas , and thus check the inordinate increase of specific forms throughout the world . Dr. Hooker has recently ...
... tend generally to spread very widely ; consequently , they will tend to supplant and exterminate several species in several areas , and thus check the inordinate increase of specific forms throughout the world . Dr. Hooker has recently ...
Página 103
... tend to produce offspring similarly characterised . This principle of preservation , or the survival of the fittest , I have called Natural Selection . It leads to the improvement of each creature in relation to its organic and ...
... tend to produce offspring similarly characterised . This principle of preservation , or the survival of the fittest , I have called Natural Selection . It leads to the improvement of each creature in relation to its organic and ...
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