KAYNAKÇA;
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http://www.egitimhane.com/2-sinif-hayat-bilgisi-dun-bugun-yarin-konu-ozetleri-9-d175313.html
http://www.bilgievi.gen.tr/frmGamePlay.aspx?GameID=363
http://www.egitimhane.com/2-sinif-hayat-bilgisi-dun-bugun-yarin-konu-ozetleri-9-d175313.html
http://www.bilgievi.gen.tr/frmGamePlay.aspx?GameID=363