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el short distances over land. ies postulate that changers in geography, climate, and sea levels were responsible. 化造成的。 mum yield and superior quality, utilizes inFORMation derived from other sciences. eby saving the seeds from freezing. build its home. can Kennel Club does not consider them sporting dogs because they are now primarily kept as pets. 们为猎犬，因为它们现在大多数作为宠物饲养。 s have been able to make important discoveries in biology and medicine. ls has been going on so long in the United States as to constitute a tradition.