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Imsuṭṭaḍ d iɣarsiwen at ujgu n weεrur (vertébrés). Ma ayarwen, tarwa n sen ttamudurt, t tteṭṭeḍ seg dmaren n tyematin deg waguren imenza n tudert n sen. Ul n sen yesεa 4 imarǧan (cavités). Allaɣ deg sen yenarna tt takerkurt (boite crânienne) iwesεen. Imsuṭṭaḍ snuffusen seg turin, lǧetta n sen tezga zeqlet (36 à 39° C).
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