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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Página 64
... inhabitants , the other species will decrease . When we travel southward and see a species decreas- ing in numbers , we may feel sure that the cause lies quite as much in other species being favoured , as in this one being hurt . So it ...
... inhabitants , the other species will decrease . When we travel southward and see a species decreas- ing in numbers , we may feel sure that the cause lies quite as much in other species being favoured , as in this one being hurt . So it ...
Página 73
... inhabitants of any small area , and to naturalisation - Action of Natural Selection , through Divergence of Character and Extinction , on the descendants from a common parent - Explains the Grouping of all organic beings . How will the ...
... inhabitants of any small area , and to naturalisation - Action of Natural Selection , through Divergence of Character and Extinction , on the descendants from a common parent - Explains the Grouping of all organic beings . How will the ...
Página 74
... inhabitants would almost immediately undergo a change , and some species might become extinct . We may conclude , from what we have seen of the intimate and complex manner in which the inhabitants of each country are bound to- gether ...
... inhabitants would almost immediately undergo a change , and some species might become extinct . We may conclude , from what we have seen of the intimate and complex manner in which the inhabitants of each country are bound to- gether ...
Página 75
... inhabitants . as all the inhabitants of each country are struggling together with nicely balanced forces , extremely slight modifications in the structure or habits of one in- habitant would often give it an advantage over others ; and ...
... inhabitants . as all the inhabitants of each country are struggling together with nicely balanced forces , extremely slight modifications in the structure or habits of one in- habitant would often give it an advantage over others ; and ...
Página 95
... inhabitants to struggle for , and become adapted to , through modifications in their structure and constitution . Lastly , isolation , by checking immigration and consequently competition , will give time for any new variety to be ...
... inhabitants to struggle for , and become adapted to , through modifications in their structure and constitution . Lastly , isolation , by checking immigration and consequently competition , will give time for any new variety to be ...
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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