下面哪一种树被称为“活化石”？（ )

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SQL Error: select id,body,options from ***_enewstiku where sourceid='31812' and id < 2542554 and id<>'2542554' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='31812' and id > 2542554 and id<>'2542554' order by id asc limit 5