The Origin of Species by Means of Natural Selection, Or, The Preservation of Favored Races in the Struggle for Life, 1-2±ÇD. Appleton, 1917 |
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... formations . But the imperfection in the geological record largely results from another and more important cause than ... formation . We can , I think , see why the geological formations of each region are almost invariably intermittent ...
... formations . But the imperfection in the geological record largely results from another and more important cause than ... formation . We can , I think , see why the geological formations of each region are almost invariably intermittent ...
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... formation . Yet if we compare any but the most closely related formations , all the spe- cies will be found to have undergone some change . When a species has once disappeared from the face of the earth , we have no reason to believe ...
... formation . Yet if we compare any but the most closely related formations , all the spe- cies will be found to have undergone some change . When a species has once disappeared from the face of the earth , we have no reason to believe ...
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... formation is probably short compared with the average duration of specific forms ; that mi- gration has played an important part in the first ap- pearance of new forms in any one area and formation ; that widely ranging species are ...
... formation is probably short compared with the average duration of specific forms ; that mi- gration has played an important part in the first ap- pearance of new forms in any one area and formation ; that widely ranging species are ...
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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 larv©¡ 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