The Origin of Species by Means of Natural Selection: Or, the Preservation of Favored Races in the Struggle for Life, 1권Hurst, 1890 - 501페이지 |
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80 페이지
... adapted to their conditions of life than any of those which happened to survive . So again a vast number of mature animals and plants , whether or not they be the best adapted to their conditions , must be annually destroyed by ...
... adapted to their conditions of life than any of those which happened to survive . So again a vast number of mature animals and plants , whether or not they be the best adapted to their conditions , must be annually destroyed by ...
105 페이지
... adapted for their own county . It might also , perhaps , have been ex- pected that naturalized plants would have belonged to a few groups more especially adapted to certain stations in their new homes . But the case is very different ...
... adapted for their own county . It might also , perhaps , have been ex- pected that naturalized plants would have belonged to a few groups more especially adapted to certain stations in their new homes . But the case is very different ...
231 페이지
... adapted for transportal by insects ; nor will he deny that all the gradations in the several species are admirably adapted in relation to the general structure of each flower for its fertilization by different insects . In this , and in ...
... adapted for transportal by insects ; nor will he deny that all the gradations in the several species are admirably adapted in relation to the general structure of each flower for its fertilization by different insects . In this , and in ...
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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 Glacial period gradations greater number groups of species habits Hence hybrids hybrids produced important individuals inhabitants inherited insects instance instincts intercrossing intermediate intervals 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 trees variability variations varieties vary whole widely different wings young