The New Encyclopædia BritannicaEncyclopædia Britannica, 1983 - Encyclopedias and dictionaries |
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Page 455
... genera . Since both genera had a remote common ancestor , they are placed in a common family . There exists no complete record of any species through time to confirm the systematists ' notions of relationships . Nevertheless , it ...
... genera . Since both genera had a remote common ancestor , they are placed in a common family . There exists no complete record of any species through time to confirm the systematists ' notions of relationships . Nevertheless , it ...
Page 721
... genera in certain groups than in others , or ( 3 ) had actually been more rapid than in more conservative lineages is a subject of some dispute . Dias- trophism has often been cited as the major causative agent for evolutionary changes ...
... genera in certain groups than in others , or ( 3 ) had actually been more rapid than in more conservative lineages is a subject of some dispute . Dias- trophism has often been cited as the major causative agent for evolutionary changes ...
Page 737
... genera with- in the family and with the specific status of some popula- tions of complex genera , such as Otus . Some of these problems await the development of new information on species isolating mechanisms , especially vocal ...
... genera with- in the family and with the specific status of some popula- tions of complex genera , such as Otus . Some of these problems await the development of new information on species isolating mechanisms , especially vocal ...
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