The Origin of Species by Means of Natural Selection: Or, The Preservation of Favored Races in the Struggle for Life, Volumen2AMS Press, 1972 |
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Página 99
... belonging to some one group has seized on the place occupied by a species belonging to a distinct group , and thus have caused its extermination . If many allied forms be developed from the successful intruder , many will have to yield ...
... belonging to some one group has seized on the place occupied by a species belonging to a distinct group , and thus have caused its extermination . If many allied forms be developed from the successful intruder , many will have to yield ...
Página 225
... belonging to the larger genera , tend to inherit the advantages which made the groups to which they belong large and their parents dominant , they are almost sure to spread widely , and to seize on more and more places in the economy of ...
... belonging to the larger genera , tend to inherit the advantages which made the groups to which they belong large and their parents dominant , they are almost sure to spread widely , and to seize on more and more places in the economy of ...
Página 240
... belonging to several classes are now known to have the power of ordinary reproduction at an unusually early age ; and we have only to acceler- ate parthenogenetic reproduction by gradual steps to an earlier and earlier age , -Chironomus ...
... belonging to several classes are now known to have the power of ordinary reproduction at an unusually early age ; and we have only to acceler- ate parthenogenetic reproduction by gradual steps to an earlier and earlier age , -Chironomus ...
Contenido
CONTENTS OF VOL | 1 |
CHAPTER X | 48 |
CHAPTER XII | 129 |
Derechos de autor | |
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Términos y frases comunes
accumulated adapted admit adult affinity allied species ancient animals appear Archipelago arctic areas become beds believe birds breeds Cambrian changes characters classification climate closely allied continent crustaceans degree deposited difficulty distant distinct species domestic doubt embryo Europe existing extinct fact faunas fertilised fertility flowers formations formerly forms fossil fresh-water Fritz Müller Gärtner genera genus geological period geological record Glacial period groups of species habits hybrids hybrids produced important individuals inhabitants inherited insects instance intermediate intervals land larvæ less living mammals manner marine Marsupials migration modified descendants mongrels mountains natural selection naturalists nearly occur oceanic islands offspring organisation parent parent-form peculiar perfect pistil plants pollen present probably produced quadrupeds reciprocal crosses regions remains remarked reproductive resemblance rocks rudimentary organs seeds Silurian slight South America species belonging stage stamens sterility structure successive suppose terrestrial tertiary tion variations varieties whilst widely different wings