في مثل هذا اليوم

يوم شهر
  • سنة-1929 : انهيار مؤشر وول ستريت، واعتبر ذلك كأول خطوة للأزمة الاقتصادية العالمية في ثلاثينات القرن العشرين.
  • سنة-1945 : انضمام أكثر من 26 دولة إلى الأمم المتحدة منها السعودية ومصر والولايات المتحدة والصين وسوريا ولبنان
  • سنة-1956 : توقيع بروتوكول سيفرز بين إنجلترا وفرنسا وإسرائيل والذي رسم دور كل دولة خلال العدوان الثلاثي على مصر.
 
حجم الخط + | -
لجميع الكائنات الحية ردود فعل تجاه أي تغير في البيئة حولها ، ولكن للحيوان إحساس أدق وأرهف بهذه التغيرات . والسبب هو أن الحيوان يتمتع بأدوات حواس مطورة إلى حد بعيد ، وأكثر الحيوانات تستطيع أن ترى وتسمع وتشم وتحس وتتذوق، ويختلف تطور كل من هذه الحواس بإختلاف الحيوانات ، مثلا ، للحشرات حاسة بصر دقيقة جدا ، بينما لا تستطيع الخفافيش أن ترى جيدا وللتعويض عن ذلك تتمتع الخفافيش بحاسة سمع مرهفة إلى درجة هائلة ، وبإمكانها تلمس طريقها في الهواء بالإستماع إلى صدى أصواتها الزاعقة .
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الكاتب: الادارة التاريخ: 2008/04/22
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