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سد چیست و چرا و چگونه ساخته میشود ...techratoمعرفی انواع سد با عکس و مشخصات آنها ...ucivil.irRecommended to you based on what's popular • Feedbackبیش از نصف جانداران جهان زیر زمین زندگی میکنند
WEBکمترین میزان اتکا به خاک، مربوط به پستانداران است که حدود ۴ درصد آنها برای یک یا چند مرحله از چرخهی زندگی خود به خاک متکی هستند؛ بهعنوان مثال برخی از پستانداران مانند سنجابهای دشتی، زیر زمین لانه میکنند.
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