On the Origin of Species by Means of Natural Selection: Or The Preservation of Favoured Races in the Struggle for LifeHumphrey Milford, Oxford University Press, 1923 - 454 páginas |
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... NATURE . ✓ 3. STRUGGLE FOR EXISTENCE 4. NATURAL SELECTION 5. LAWS OF VARIATION PAGE 1 7 7 41 56 73 119 6. DIFFICULTIES ON THEORY 154 7. INSTINCT 186 8. HYBRIDISM 220 9. ON THE IMPERFECTION OF THE GEOLOGICAL RECORD 250 10. ON THE ...
... NATURE . ✓ 3. STRUGGLE FOR EXISTENCE 4. NATURAL SELECTION 5. LAWS OF VARIATION PAGE 1 7 7 41 56 73 119 6. DIFFICULTIES ON THEORY 154 7. INSTINCT 186 8. HYBRIDISM 220 9. ON THE IMPERFECTION OF THE GEOLOGICAL RECORD 250 10. ON THE ...
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... Selection successive slight variations . I will then pass on to the variability of species in a state of nature ... Natural Selection , will be treated at some length in the fourth chapter and we shall then see how Natural Selection ...
... Selection successive slight variations . I will then pass on to the variability of species in a state of nature ... Natural Selection , will be treated at some length in the fourth chapter and we shall then see how Natural Selection ...
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... nature the conditions of life do change , varia- tions and reversions of character probably do occur ; but natural selection , as will hereafter be explained , will determine how far the new characters thus arising shall be preserved ...
... nature the conditions of life do change , varia- tions and reversions of character probably do occur ; but natural selection , as will hereafter be explained , will determine how far the new characters thus arising shall be preserved ...
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... natural selection , ' as will hereafter be more fully explained , two sub - breeds might be formed . This , perhaps , partly explains what has been remarked by some authors , namely , that the varieties kept by savages have more of the ...
... natural selection , ' as will hereafter be more fully explained , two sub - breeds might be formed . This , perhaps , partly explains what has been remarked by some authors , namely , that the varieties kept by savages have more of the ...
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... natural selection to accumulate , in the same manner as man can accumu- late in any given direction individual differences in his domesticated productions . These individual differences generally affect what naturalists consider ...
... natural selection to accumulate , in the same manner as man can accumu- late in any given direction individual differences in his domesticated productions . These individual differences generally affect what naturalists consider ...
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Términos y frases comunes
accumulated adapted affinities allied species America amount analogous ancient appear Archipelago become bees believe birds breeds cause cells characters cirripedes climate closely allied colour common parent continuous crossed crustaceans degree difficulty distinct species divergence doubt embryo endemic Europe existing exterminated extinct extremely facts favourable fertility flowers formations forms fossil Gärtner genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hermaphrodites hybrids hybrids produced important individuals inhabitants inherited insects instance instincts intercrossing land larvæ less living male mammals manner Marsupials migration modification modified descendants natural selection naturalists nearly nest oceanic islands offspring organisation perfect pigeons pistil plants pollen present principle probably produced progenitor ranked reciprocal crosses remarked resemble rock-pigeon rudimentary organs seeds sexual selection Silurian slight South America sterility structure struggle successive suppose swimbladder tend theory tion trees variability variation vary whole widely