“双生子爬梯实验”证明了下列哪种因素对个体发展的影响（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='31326' and id < 2513033 and id<>'2513033' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='31326' and id > 2513033 and id<>'2513033' order by id asc limit 5