Biologist tan iyyat ardahan fal issin ich-ikilan ɣas: nefran n tudabat n tamudre (meɣ tamudre) tisawadat irrizaɣ n organizm n tamudre d nefran n akarach n aratan (meɣ tudabat n akarach n aratan meɣ araw) isawadan iddikud n aratan ijraw nen tamudre