In This part we will study : Types of symbiosis: A- Mutualism B- Commensalism C- Parasitism Parasitism: It is a food relationship between two different kinds of living organisms where one benefits from the other (known as a parasite) and the other one is harmed (known as a host). External parasitism Definition: Parasites live externally on the host’s body and feed by sucking its blood. Internal parasitism Definition: Parasites live inside the host’s body and share with the host its digested food or feed on its tissues and cells. لينك تحميل الملزمة : Grade 5 – unit Three – lesson One – First Term 2020 http://bit.ly/32W2EfK تم شرح هذا الدرس في (3) فيديوهات شاهدها بالترتيب Food relationships among living organisms (Part (1/3 https://youtu.be/-ui9t8-fLvM (Part (2/3 https://youtu.be/lYAEulvnXIM (Part (3/3 تشاهده الان https://youtu.be/Yfxa7XFSUZc 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