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 307
... points as mere superficial sculpture . Moreover , other forms , which are not found in the Chalk of Europe , but which occur in the formations either above or below , occur in the same order at these distant points of the world . In the ...
... points as mere superficial sculpture . Moreover , other forms , which are not found in the Chalk of Europe , but which occur in the formations either above or below , occur in the same order at these distant points of the world . In the ...
Página 330
... points of the earth's surface . Undoubtedly there are many cases of extreme difficulty in understanding how the same species could possibly have migrated from one point to the several distant and isolated points , where now found ...
... points of the earth's surface . Undoubtedly there are many cases of extreme difficulty in understanding how the same species could possibly have migrated from one point to the several distant and isolated points , where now found ...
Página 331
... points of the northern and southern hemispheres . The answer , as I believe , is , that mammals have not been able to migrate , whereas some plants , from their varied means of dispersal , have migrated across the wide and broken ...
... points of the northern and southern hemispheres . The answer , as I believe , is , that mammals have not been able to migrate , whereas some plants , from their varied means of dispersal , have migrated across the wide and broken ...
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