On the Origin of Species by Means of Natural Selection: Or The Preservation of Favoured Races in the Struggle for LifeHumphrey Milford, Oxford University Press, 1923 - 454 páginas |
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... appear till 1859 , when Darwin was over fifty . It completely revolutionized the sciences of Botany and Zoology , and made the doctrine of Organic Evolution , till then admitted only by a few advanced philosophical biologists , the ...
... appear till 1859 , when Darwin was over fifty . It completely revolutionized the sciences of Botany and Zoology , and made the doctrine of Organic Evolution , till then admitted only by a few advanced philosophical biologists , the ...
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... appearing to be far more susceptible than any other part of the organisation , to the action of any change in the conditions of life . Nothing is more easy than to tame an animal , and few things more difficult than to get it to breed ...
... appearing to be far more susceptible than any other part of the organisation , to the action of any change in the conditions of life . Nothing is more easy than to tame an animal , and few things more difficult than to get it to breed ...
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... appears to be directly due to such conditions ; but in some cases it can be shown that quite opposite conditions produce similar changes of structure . Nevertheless some slight amount of change may , I think , be attributed to the ...
... appears to be directly due to such conditions ; but in some cases it can be shown that quite opposite conditions produce similar changes of structure . Nevertheless some slight amount of change may , I think , be attributed to the ...
Página 12
... appears , and we see it in the father and child , we cannot tell whether it may not be due to the same cause having acted on both ; but when amongst individuals , apparently exposed to the same conditions , any very rare deviation , due ...
... appears , and we see it in the father and child , we cannot tell whether it may not be due to the same cause having acted on both ; but when amongst individuals , apparently exposed to the same conditions , any very rare deviation , due ...
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... appears , it tends to appear in the offspring at a corresponding age , though sometimes earlier . many cases this could not be otherwise : thus the inherited peculiarities in the horns of cattle could appear only in the offspring when ...
... appears , it tends to appear in the offspring at a corresponding age , though sometimes earlier . many cases this could not be otherwise : thus the inherited peculiarities in the horns of cattle could appear only in the offspring when ...
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Términos y frases comunes
accumulated adapted affinities allied species America amount analogous ancient appear Archipelago become bees believe birds breeds cause cells characters cirripedes climate closely allied colour common parent continuous crossed crustaceans degree difficulty distinct species divergence doubt embryo endemic Europe existing exterminated extinct extremely facts favourable fertility flowers formations forms fossil Gärtner genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hermaphrodites hybrids hybrids produced important individuals inhabitants inherited insects instance instincts intercrossing land larvæ less living male mammals manner Marsupials migration modification modified descendants natural selection naturalists nearly nest oceanic islands offspring organisation perfect pigeons pistil plants pollen present principle probably produced progenitor ranked reciprocal crosses remarked resemble rock-pigeon rudimentary organs seeds sexual selection Silurian slight South America sterility structure struggle successive suppose swimbladder tend theory tion trees variability variation vary whole widely