وفر 50٪ من خلال الاشتراك السنوي في مجرة واحصل على تصفح لا محدود لأفضل محتوى عربي على الإنترنت.

اشترك الآن

تمت عملية الاشتراك بنجاح

إغلاق

عذراً، عذرا،أنت مشترك مسبقاً بالنشرة البريدية

إغلاق

عذراً، هناك مشكلة في البريد الالكتروني

إغلاق
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الطب

تاريخ طبيعي |  Natural history

26 أبريل 2020


وهو فرع من العلوم يهتم بدراسة الكائنات الحية وتفاعلها مع بيئاتها وتغيراتها حسب الاجيال وحسب توزعها الجغرافي.