The Origin of Species by Means of Natural Selection, Or, The Preservation of Favored Races in the Struggle for Life, 1-2권D. Appleton, 1917 |
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... belonging to the same orders , families , or genera , with those now living , yet are often , in some degree , intermediate in character between . existing groups ; and we can understand this fact , for the extinct species lived at ...
... belonging to the same orders , families , or genera , with those now living , yet are often , in some degree , intermediate in character between . existing groups ; and we can understand this fact , for the extinct species lived at ...
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... belonging to distinct families had slowly become adapted to live more and more out of water , and to breathe the air . For these species , from belonging to distinct families , would have differed to a certain extent , and in ac ...
... belonging to distinct families had slowly become adapted to live more and more out of water , and to breathe the air . For these species , from belonging to distinct families , would have differed to a certain extent , and in ac ...
99 페이지
... belonging to some one group has seized on the place occupied by a species belonging to a distinct group , and thus have caused its extermination . If many allied forms be developed from the successful intruder , many will have to yield ...
... belonging to some one group has seized on the place occupied by a species belonging to a distinct group , and thus have caused its extermination . If many allied forms be developed from the successful intruder , many will have to yield ...
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adapted affinity allied species ancient animals appear Archipelago beak become believe belonging birds breeds Cambrian cause characters climate closely allied colour common continent crossed crustaceans degree developed difficulty distinct species domestic doubt eggs embryo Europe existing extinct extremely facts favourable fertilised fertility fish flowers formation formerly forms fossil Fritz Müller Gärtner genera genus geological geological period Glacial period gradations groups of species habits Hence hybrids hybrids produced important individuals inhabitants inherited insects instance instincts intercrossing intermediate land larvæ less living male mammals manner Marsupials migration modified descendants natural selection naturalists nearly occur oceanic islands offspring organisation parent peculiar perfect pigeon pistil plants pollen present probably produced progenitor quadrupeds ranked reciprocal crosses remarked resemblance seeds Silurian slight South America stage stamens sterility structure successive suppose theory tion variability variations varieties vary whilst whole widely different wings