The Origin of Species by Means of Natural Selection; Or, the Preservation of Favored Races in the Struggle for Life ...A.L. Burt, 1890 - 538페이지 |
도서 본문에서
84개의 결과 중 1 - 3개
203 페이지
... respect to the assumed inutility of various parts and organs , it is hardly necessary to observe that even in the higher and best - known animals many struct- ures exist , which are so highly developed that no one doubts that they are ...
... respect to the assumed inutility of various parts and organs , it is hardly necessary to observe that even in the higher and best - known animals many struct- ures exist , which are so highly developed that no one doubts that they are ...
236 페이지
... respect to climbing plants , I need not repeat what has been so lately said . It has often been asked , if natural selection be so potent , why has not this or that structure been gained by certain species , to which it would apparently ...
... respect to climbing plants , I need not repeat what has been so lately said . It has often been asked , if natural selection be so potent , why has not this or that structure been gained by certain species , to which it would apparently ...
464 페이지
... respect to the final cause of the young in such groups not passing through any metamorphosis , we can see that this would follow from the following contingencies : namely , from the young having to provide at a very early age for their ...
... respect to the final cause of the young in such groups not passing through any metamorphosis , we can see that this would follow from the following contingencies : namely , from the young having to provide at a very early age for their ...
기타 출판본 - 모두 보기
자주 나오는 단어 및 구문
adapted admit affinities allied species America ancient appear Asa Gray beak become bees believe belonging birds breeds cause cells characters climate closely allied color continued crossed crustaceans degree developed difficulty distinct species domestic doubt effects eggs embryo existing extinct extremely facts favorable females fertility flowers formation forms fossil Fritz Müller genera genus geological geological period gilt top Glacial period gradations greater number groups of species habits Hence hybrids hybrids produced important individuals inhabitants inherited insects instance instincts intercrossing intermediate kind lamellæ larvæ less living male mammals manner marsupials migration modified descendants natural selection naturalists nearly nest oceanic islands offspring organs parent peculiar perfect pigeons pistil pollen present principle probably produced quadrupeds ranked remarked resemblance rudimentary seeds sexual selection Silurian slight South America stamens sterility structure successive suppose tend theory tion variability variations varieties vary whole widely different wings young