形成次级生物量的生物类群是（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='29863' and id < 2422583 and id<>'2422583' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='29863' and id > 2422583 and id<>'2422583' order by id asc limit 5