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 64
... accumulated through natural selection , other modifications , often of the most unexpected nature , will ensue . As ... accumulation of variations profitable at that age , and by their inheritance at a corresponding age 64 ON THE ORIGIN ...
... accumulated through natural selection , other modifications , often of the most unexpected nature , will ensue . As ... accumulation of variations profitable at that age , and by their inheritance at a corresponding age 64 ON THE ORIGIN ...
Página 89
... accumulated by natural selection . When a dotted line reaches one of the horizontal lines , and is there marked by a small numbered letter , a sufficient amount of variation is supposed to have been accumulated to form it into a fairly ...
... accumulated by natural selection . When a dotted line reaches one of the horizontal lines , and is there marked by a small numbered letter , a sufficient amount of variation is supposed to have been accumulated to form it into a fairly ...
Página 180
... accumulated and augmented through natural selection . A structure which has been developed through long - continued selection , when it ceases to be of service to a species , generally becomes variable , as we see with rudimentary ...
... accumulated and augmented through natural selection . A structure which has been developed through long - continued selection , when it ceases to be of service to a species , generally becomes variable , as we see with rudimentary ...
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