On the Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeEaston Press, 1976 - 470 páginas |
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Página 143
... habits of life will rarely have been developed at an early period in great numbers and under many subordinate forms ... habits in the individuals of the same species . In either case it would be easy for natural selection to adapt the ...
... habits of life will rarely have been developed at an early period in great numbers and under many subordinate forms ... habits in the individuals of the same species . In either case it would be easy for natural selection to adapt the ...
Página 145
... habits of this genus , that a Mexican Colaptes has been described by De Saussure as boring holes into hard wood in order to lay up a store of acorns . Petrels are the most aërial and oceanic of birds , but in the quiet sounds of Tierra ...
... habits of this genus , that a Mexican Colaptes has been described by De Saussure as boring holes into hard wood in order to lay up a store of acorns . Petrels are the most aërial and oceanic of birds , but in the quiet sounds of Tierra ...
Página 408
... habits of life with their parents ; for in this case , it would be indispensable for their existence that they should be modified in the same manner as their parents . Again , with respect to the singular fact that many terrestrial and ...
... habits of life with their parents ; for in this case , it would be indispensable for their existence that they should be modified in the same manner as their parents . Again , with respect to the singular fact that many terrestrial and ...
Contenido
VARIATION UNDER NATURE | 30 |
STRUGGLE FOR EXISTENCE | 45 |
NATURAL SELECTION | 59 |
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Términos y frases comunes
accumulated adapted admit affinities allied species America ancient appear beak become bees believe belonging birds breeds cause cells characters climate closely allied colour common progenitor continuous crossed crustaceans degree developed difficulty distinct species divergence doubt effects eggs embryo existing exterminated extinct extremely facts favourable fertilised fertility flowers formation forms fossil Fritz Müller genera genus geological geological period gradations greater number groups of species habits Hence hybrids hybrids produced important increase individuals inhabitants inherited insects instance instincts intercrossing intermediate kind lamellæ larvæ less living male mammals manner marsupials migration modified descendants natural selection naturalists nearly nest occasionally offspring organisation organs Origin of Species parent peculiar perfect pigeons pistil plants pollen present preserved principle probably produced quadrupeds ranked reciprocal crosses remarked resemblance rudimentary seeds slight South America stamens sterility structure struggle successive supposed swimbladder theory variability variations varieties vary whilst whole wings young