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Nettimateriaalia

By Carbon_cycle-cute_diagram.svg: * Carbon_cycle-cute_diagram.jpeg: User Ke­vin Saff on en.wiki­pe­dia Derivative work: FischX derivative work: Olli (Carbon_cycle-cute_diagram.svg) [Public domain], via Wikimedia Commons

BI1 Eliö­maa­ilmaAar­ne Hag­man; Kurs­sin ri­kas­tus­ma­te­ri­aa­lia 201322.9.2013