ساينس الصف الخامس الإبتدئي الفصل الدراسي الاول ساينس خامسة ابتدائي – ترم أول In This part we will study : The ecosystem: It is a natural area that contains some living organisms (such as plants and animals) and non-living things (such as air – water – soil). The components of ecosystem: 1- Non-living things such as air, soil and water 2- Living organisms such as plants, fungi, algae and animals. Classification of ecosystems: By size: 1. Small such as an area of land or a water pond . 2. Large such as a forest, a desert, or an ocean. 3. Very large such as the universe which is considered the unified ecosystem. Factors that disturb the environmental balance Natural changes Man interference Factors that keep the environmental balance : 1) Predation 2) Saprophytism لمتابعة مستر احمد الباشا وكل ما يخص الساينس : جروب الفيس بوك http://bit.ly/2Of1mcN صفحة الفيس بوك http://bit.ly/2Gq5xMo بالتوفيق مستر احمد الباشا