On the Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeD. Appleton, 1909 - 430 páginas |
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Página 15
... adapted to catch insects under the bark of trees . In the case of the mistletoe , which draws its nourishment from certain trees , which has seeds that must be transported by certain birds , and which has flowers with separate sexes ...
... adapted to catch insects under the bark of trees . In the case of the mistletoe , which draws its nourishment from certain trees , which has seeds that must be transported by certain birds , and which has flowers with separate sexes ...
Página 76
... adapted for diving , allows it to compete with other aquatic insects , to hunt for its own prey , and to escape serving as prey to other animals . The store of nutriment laid up within the seeds of many plants seems at first sight to ...
... adapted for diving , allows it to compete with other aquatic insects , to hunt for its own prey , and to escape serving as prey to other animals . The store of nutriment laid up within the seeds of many plants seems at first sight to ...
Página 80
... adapted forms could not freely enter , we should then have places in the economy of nature which would assuredly be better filled up , if some of the original inhabitants were in some manner modified ; for , had the area been open to ...
... adapted forms could not freely enter , we should then have places in the economy of nature which would assuredly be better filled up , if some of the original inhabitants were in some manner modified ; for , had the area been open to ...
Página 81
... adapted to each other and to the physical conditions under which they live , that none of them could anyhow be improved ; for in all countries , the natives have been so far conquered by naturalised productions , that they have allowed ...
... adapted to each other and to the physical conditions under which they live , that none of them could anyhow be improved ; for in all countries , the natives have been so far conquered by naturalised productions , that they have allowed ...
Página 82
... adapted to the most complex conditions of life , and should plainly bear the stamp of far higher workmanship ? It may metaphorically be said that natural selection is daily and hourly scrutinising , throughout the world , every ...
... adapted to the most complex conditions of life , and should plainly bear the stamp of far higher workmanship ? It may metaphorically be said that natural selection is daily and hourly scrutinising , throughout the world , every ...
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Términos y frases comunes
accumulated adapted affinities allied species America analogous ancient animals appear archipelago become bees believe birds breeds cause cells characters cirripedes climate closely allied colour continuous crossed crustaceans degree difficulty distinct species divergence domestic doubt embryo endemic existing exterminated extinct extremely facts favourable fertilised fertility flowers formations forms fossil Gärtner genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hybrids hybrids produced important increase individuals inhabitants inherited insects instance instincts intercrossing intermediate larvæ laws less living males mammals manner migration modification modified descendants natural selection naturalists nearly nest occasionally offspring organic organisation origin of species perfect pigeons plants pollen present principle probably produced progenitor ranked reciprocal crosses remarked resemble rock-pigeon rudimentary seeds sexual sexual selection Silurian slight sometimes South America sterility structure struggle successive supposed swimbladder tend theory variability variations varieties vary whole widely