下列属于物种密度相关因素的有（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='29863' and id < 2422563 and id<>'2422563' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='29863' and id > 2422563 and id<>'2422563' order by id asc limit 5