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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74 페이지
... become converted into new and distinct species . Thus the larger genera tend to become larger ; and throughout nature the forms of life which are now dominant tend to become still more dominant by leaving many modified and dominant ...
... become converted into new and distinct species . Thus the larger genera tend to become larger ; and throughout nature the forms of life which are now dominant tend to become still more dominant by leaving many modified and dominant ...
133 페이지
... become rare . Rarity , as geology tells us , is the precursor to extinction . We can see that any form which is ... become extinct . That the number of spe- cific forms has not indefinitely increased , geology plainly tells us ; and we ...
... become rare . Rarity , as geology tells us , is the precursor to extinction . We can see that any form which is ... become extinct . That the number of spe- cific forms has not indefinitely increased , geology plainly tells us ; and we ...
146 페이지
... become extinct . So it probably will be with many whole collateral lines of descent , which will be conquered by later and improved lines . If , however , the modified offspring of a species get into some distinct country , or become ...
... become extinct . So it probably will be with many whole collateral lines of descent , which will be conquered by later and improved lines . If , however , the modified offspring of a species get into some distinct country , or become ...
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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