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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... tend to 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 ...
... tend to 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 ...
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... tend to spread and supplant many others . Alph . de Candolle has shown that those species which spread widely , tend generally to spread very widely ; consequently , they will tend to supplant and exterminate several species in several ...
... tend to spread and supplant many others . Alph . de Candolle has shown that those species which spread widely , tend generally to spread very widely ; consequently , they will tend to supplant and exterminate several species in several ...
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... tend to vary in the same manner , and homologous parts tend to cohere . Modifications in hard parts and in external parts sometimes affect softer and internal parts . When one part is largely developed , perhaps it tends to draw ...
... tend to vary in the same manner , and homologous parts tend to cohere . Modifications in hard parts and in external parts sometimes affect softer and internal parts . When one part is largely developed , perhaps it tends to draw ...
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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