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
78개의 결과 중 1 - 3개
98 페이지
... less severe , and there will have been less modification and less extermination . Hence , we can understand how it is that the flora of Maderia , according to Oswald Heer , resembles to a certain extent the extinct tertiary flora of ...
... less severe , and there will have been less modification and less extermination . Hence , we can understand how it is that the flora of Maderia , according to Oswald Heer , resembles to a certain extent the extinct tertiary flora of ...
360 페이지
... less number of characters ; for they would at this early stage of descent have diverged in a less degree from their common progenitor . Thus it comes that ancient and extinct genera are often in a greater or less degree intermediate in ...
... less number of characters ; for they would at this early stage of descent have diverged in a less degree from their common progenitor . Thus it comes that ancient and extinct genera are often in a greater or less degree intermediate in ...
467 페이지
Charles Darwin. us more or less plainly the structure of the less modified and ancient progenitor of the group , we can see why ancient and extinct forms so often resemble in their adult state the embryos of existing species of the same ...
Charles Darwin. us more or less plainly the structure of the less modified and ancient progenitor of the group , we can see why ancient and extinct forms so often resemble in their adult state the embryos of existing species of the same ...
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