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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... kinds as in the surround- ing virgin forest . What a struggle must have gone on during long centuries between the several kinds of trees each annually scattering its seeds by the thou- sand what war between insect and insect - between ...
... kinds as in the surround- ing virgin forest . What a struggle must have gone on during long centuries between the several kinds of trees each annually scattering its seeds by the thou- sand what war between insect and insect - between ...
175 페이지
... kinds , and were altogether 537 in number ; and yet the viscid mud was all contained in a breakfast cup ... kinds of seeds , though they reject many other kinds after having swallowed them ; even small fish swallow seeds of moderate size ...
... kinds , and were altogether 537 in number ; and yet the viscid mud was all contained in a breakfast cup ... kinds of seeds , though they reject many other kinds after having swallowed them ; even small fish swallow seeds of moderate size ...
178 페이지
... kinds of flower- ing plants ; if we compare this moderate number with the species which swarm over equal areas in South- Western Australia or at the Cape of Good Hope , we must admit that some cause , independently of different physical ...
... kinds of flower- ing plants ; if we compare this moderate number with the species which swarm over equal areas in South- Western Australia or at the Cape of Good Hope , we must admit that some cause , independently of different physical ...
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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