The origin of species by means of natural selectionРипол Классик, 1929 - 488페이지 |
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83개의 결과 중 1 - 5개
3 페이지
... modification and c0adaptation. At the commencement of my observations it seemed to me probable that a careful study of domesticated animals and of cultivated plants would ofl'er the best chance of making out this obscure roblem. Nor ...
... modification and c0adaptation. At the commencement of my observations it seemed to me probable that a careful study of domesticated animals and of cultivated plants would ofl'er the best chance of making out this obscure roblem. Nor ...
74 페이지
... modification, which in the course of es chanced to arise, and which in an way favoured t e individuals of an of the species, by better adapting them to their alter conditions, would tend to be preserved; and natural selection would thus ...
... modification, which in the course of es chanced to arise, and which in an way favoured t e individuals of an of the species, by better adapting them to their alter conditions, would tend to be preserved; and natural selection would thus ...
75 페이지
... modifying and improving some of the varying in abitants. For as all the inhabitants of each country are struggling together with nicely balanced forces, extremely slight modifications in the structure or habits of one inhabitant would ...
... modifying and improving some of the varying in abitants. For as all the inhabitants of each country are struggling together with nicely balanced forces, extremely slight modifications in the structure or habits of one inhabitant would ...
78 페이지
... modifications, often of the most unexpected nature. As we see that those variations which under domestication appear ... modify organic bein s at any age, by the accumulation of variations profitable at that age, and by their inheritance ...
... modifications, often of the most unexpected nature. As we see that those variations which under domestication appear ... modify organic bein s at any age, by the accumulation of variations profitable at that age, and by their inheritance ...
79 페이지
... modifications in the adult wilzlflprobably often afl'ect the structure of the larva; but in cases natural selection will ... modification would be very slow, an there would be simultaneousl the most rigorous selection of the young birds ...
... modifications in the adult wilzlflprobably often afl'ect the structure of the larva; but in cases natural selection will ... modification would be very slow, an there would be simultaneousl the most rigorous selection of the young birds ...
목차
5 | |
ON was GEOLOGICAL SUCCESSION OF ORGANIC | 155 |
GEOGRAPHICAL DISTRIBUTION | 282 |
Gnoonnmcu DISTRIBUTION Continued | 302 |
RECAPITULATION AND CONCLUSION | 415 |
41 | 449 |
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action adapted advantage allied America amount ancient animals appear become believe birds breeds cause characters climate closely common considered continuous crossed descendants difl'erent distinct domestic doubt evidence existing extinct extremely facts families favourable fertility find first flowers follow formations forms genera genus give given greater groups habits hand Hence hybrids important increase individuals inhabitants inherited insects instance instincts intermediate islands kind known land laws less lines living look males manner means migration modification namely natural selection naturalists nearly never observed occur organic origin parent perfect period plants points present principle probably produced range ranked reason regions remains remarked resemble seeds seems seen separated shown single slight sometimes species sterility structure struggle successive suppose tend theory tion trees variability variations varieties vary whole widely