The origin of species by means of natural selectionРипол Классик, 1929 - 454페이지 |
도서 본문에서
80개의 결과 중 1 - 5개
6 페이지
... extinct species, in the same manner asthe acknowledged varieties of any one species are the descendants of that species. Furthermore, I am convinced that Natural Selection has been the main but not exclusive means of modification ...
... extinct species, in the same manner asthe acknowledged varieties of any one species are the descendants of that species. Furthermore, I am convinced that Natural Selection has been the main but not exclusive means of modification ...
22 페이지
... extinct in the wild state. But birds breeding on precipices, and good fliers, are unlikely to be exterminated; and the common rock-pigeon, which has the same habits with the domestic breeds, has not been exterminated even on several of ...
... extinct in the wild state. But birds breeding on precipices, and good fliers, are unlikely to be exterminated; and the common rock-pigeon, which has the same habits with the domestic breeds, has not been exterminated even on several of ...
23 페이지
... extinct or unknown. So many strange coutingencies seem to me improbable in the highest degree. Some facts in regard to the colouring of pigeons well deserve consideration. The rock-pigeon is of a slat - blue, and has a white rump (the ...
... extinct or unknown. So many strange coutingencies seem to me improbable in the highest degree. Some facts in regard to the colouring of pigeons well deserve consideration. The rock-pigeon is of a slat - blue, and has a white rump (the ...
48 페이지
... extinct, or they may endure as varieties for very long eriods, as has been shown to be the case by Mr. We on with the varieties of certain fossil land-shells in Madeira. If a variety were to flourish so as to exceed in numbers the ...
... extinct, or they may endure as varieties for very long eriods, as has been shown to be the case by Mr. We on with the varieties of certain fossil land-shells in Madeira. If a variety were to flourish so as to exceed in numbers the ...
61 페이지
... number may be produced, and yet the average stock be fully kept up; but if many eg or young are destroyed, many must he produced, or ii: species will become extinct. It would suffice to keep up the full number of STRUGGLE FOR EXISTENCE 61.
... number may be produced, and yet the average stock be fully kept up; but if many eg or young are destroyed, many must he produced, or ii: species will become extinct. It would suffice to keep up the full number of STRUGGLE FOR EXISTENCE 61.
목차
5 | |
ON was GEOLOGICAL SUCCESSION OF ORGANIC | 155 |
GEOGRAPHICAL DISTRIBUTION | 282 |
Gnoonnmcu DISTRIBUTION Continued | 302 |
RECAPITULATION AND CONCLUSION | 415 |
41 | 449 |
기타 출판본 - 모두 보기
자주 나오는 단어 및 구문
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