The Origin of Species by Means of Natural Selection,: Or the Preservation of Favoured Races in the Struggle for LifeAppleton, 1898 - 432 páginas |
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Página 125
... migration has played , when the formations of any one great region , as those of Europe , are considered ; he may urge the apparent , but often falsely apparent , sudden coming in of whole groups of species . He may ask where are the ...
... migration has played , when the formations of any one great region , as those of Europe , are considered ; he may urge the apparent , but often falsely apparent , sudden coming in of whole groups of species . He may ask where are the ...
Página 130
... migration , are related in a close and important manner to the differences between the productions of various regions . We see this in the great difference in nearly all the terrestrial productions of the New and Old Worlds , excepting ...
... migration , are related in a close and important manner to the differences between the productions of various regions . We see this in the great difference in nearly all the terrestrial productions of the New and Old Worlds , excepting ...
Página 133
... migration of the more dominant forms of life from one region into another having been more or less effectually prevented , at periods more or less remote ; -on the nature and number of the former immigrants ; and on the action of the ...
... migration of the more dominant forms of life from one region into another having been more or less effectually prevented , at periods more or less remote ; -on the nature and number of the former immigrants ; and on the action of the ...
Página 134
... migrate in a body into a new and afterwards isolated country , they would be little liable to modification ; for neither migration nor isolation in themselves effect any- thing . These principles come into play only by bring- ing ...
... migrate in a body into a new and afterwards isolated country , they would be little liable to modification ; for neither migration nor isolation in themselves effect any- thing . These principles come into play only by bring- ing ...
Página 135
... migrated from the same region ; for during the vast geographical and climatal changes which have supervened since ancient times , almost any amount of migration is possible . But in many other cases , in which we have reason to believe ...
... migrated from the same region ; for during the vast geographical and climatal changes which have supervened since ancient times , almost any amount of migration is possible . But in many other cases , in which we have reason to believe ...
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Términos y frases comunes
admit affinity allied species ancient animals appear Archipelago arctic areas become believe birds Cambrian changes characters cies classification climate closely allied common progenitor continent crustaceans degree deposited difficulty distant distinct species domestic doubt embryo eral 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 sediment seeds Silurian South America stage stamens sterility structure successive suppose terrestrial tertiary theory tion variations varieties whilst widely different wings