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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... adapted individuals , supposing that there is any variability in a favourable direction , will tend to propagate their kind in larger numbers than the less well adapted . If the numbers be wholly kept down by the causes just indicated ...
... adapted individuals , supposing that there is any variability in a favourable direction , will tend to propagate their kind in larger numbers than the less well adapted . If the numbers be wholly kept down by the causes just indicated ...
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Charles Darwin. commonly looked at as specially created and adapted for their own country . It might also , perhaps , have been expected that naturalised plants would have be- longed to a few groups more especially adapted to certain ...
Charles Darwin. commonly looked at as specially created and adapted for their own country . It might also , perhaps , have been expected that naturalised plants would have be- longed to a few groups more especially adapted to certain ...
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... adapted for the same functions . A good instance is afforded by the close resemblance of the jaws of the dog and Tasmanian wolf or Thylacinus , -animals which are widely sundered in the natural system . But this resemblance is confined ...
... adapted for the same functions . A good instance is afforded by the close resemblance of the jaws of the dog and Tasmanian wolf or Thylacinus , -animals which are widely sundered in the natural system . But this resemblance is confined ...
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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