ساينس الصف الثاني الاعدادي – الفصل الدراسي الاول ساينس تانية اعدادي – ترم اول In This part we will study : First : The extinct species The number of living organisms now is 10 million species , about 138 species becomes extinct every day Examples of some extinct species in the old times, the most famous of them are : Examples of some endangered species: – There are about 5000 endangered species, the most popular of them are : 1. Panda bear 2. Rhinoceros 3. Bald eagle 4. Ibis bird 5. Papyrus plant Food chain: It is a path of energy that transmits from a living organism to another in the ecosystem . • Ecosystem is classified according to the degree of the effect of extinction on it into : Simple ecosystem : It is an ecosystem that has a few members and it is severely affected by the absence of one of its species. Complicated ecosystem : It is an ecosystem that has multiple members and it is not affected much by the absence of one of its species. Natural protectorates: They are safe areas established to protect endangered species in their homeland . 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