The Origin of Species by Means of Natural Selection: Or, the Preservation of Favored Races in the Struggle for Life, 1권D. Appleton, 1898 |
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vi 페이지
... plants - Nature of the checks to increase - Com- petition universal - Effects of Climate - Protection from the number of individuals - Complex relations of all animals and plants throughout nature - Struggle for life most severe between ...
... plants - Nature of the checks to increase - Com- petition universal - Effects of Climate - Protection from the number of individuals - Complex relations of all animals and plants throughout nature - Struggle for life most severe between ...
xxiv 페이지
... plants and animals are not separated from the extinct by new creations , but are to be regarded as their descendants through contin- ued reproduction . " A well - known French botanist , M. Lecoq , writes in 1854 ( Etudes sur Géograph ...
... plants and animals are not separated from the extinct by new creations , but are to be regarded as their descendants through contin- ued reproduction . " A well - known French botanist , M. Lecoq , writes in 1854 ( Etudes sur Géograph ...
4 페이지
... plant itself . It is , therefore , of the highest importance to gain a clear insight into the means of modification ... plants would offer the best chance of making out this obscure problem . Nor have I been disappointed ; in this and ...
... plant itself . It is , therefore , of the highest importance to gain a clear insight into the means of modification ... plants would offer the best chance of making out this obscure problem . Nor have I been disappointed ; in this and ...
7 페이지
... plants and ani- mals , one of the first points which strikes us is , that they generally differ more from each other than do the in- dividuals of any one species or variety in a state of nature . And if we reflect on the vast diversity ...
... plants and ani- mals , one of the first points which strikes us is , that they generally differ more from each other than do the in- dividuals of any one species or variety in a state of nature . And if we reflect on the vast diversity ...
10 페이지
... plants and ani- mals when reared under new or unnatural condi- tions . Many facts clearly show how eminently sus- ceptible the reproductive system is to very slight changes in the surrounding conditions . Nothing is more easy than to ...
... plants and ani- mals when reared under new or unnatural condi- tions . Many facts clearly show how eminently sus- ceptible the reproductive system is to very slight changes in the surrounding conditions . Nothing is more easy than to ...
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adapted advantage allied analogous animals and plants appear Asa Gray beak become bees believe birds breeds caudicle cause cells characters climate closely colour common crossed cuckoo degree descendants developed difficulty distinct species disuse divergence domestic animals domestic races doubt effects eggs existence extinct extremely facts favourable females flowers forms Fritz Müller genera genus giraffe gradations greater number groups habits Hence hermaphrodites hive-bee important increase inhabitants inherited insects instance instincts intercrossing intermediate kind lamellæ large number larger genera larvæ less males manner Melipona Mivart modified natural selection naturalists nearly nest occasionally offspring organisation organs origin Origin of Species parent perfect period pigeons pollen pollen-grains present preserved prey principle probably produced progenitor quadrupeds rank rarely Red Grouse relation remarked resemble rock-pigeon seeds sexes sexual selection slight stamens striped structure struggle supposed swimbladder tend tendency tion tree variability variations varieties vary widely wings young