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Matter- Changes of the Matter Solution -Alkalis, acids and salts. Matter- Changes of the Matter Solution -Alkalis, acids and salts. Alkalis, acids and salts. It is a change in the shape of the matter without any change in its structure. 2- Changing of water into ice or vapour.

المشرف على الموقع ashraf taha. المشرف على الموقع ashraf taha. عرض الملف الشخصي الكامل الخاص بي.

Is the vital process which provides the body with energy and getting rid of harmful substances as carbon dioxide and water vapour. All living organisms need energy to perform their vital activities so they must respire to obtain this energy by burning food . It is the system which provides the body of the living organism with oxygen and getting rid of carbon dioxide and water vapour . The structure of human respiratory system.

Science For Sixth Primary- - Excretion in human. Is a process of getting rid wastes resulted from food burning inside the body cells . B- The urinary system .

الجهاز الهضمي The Digestive System. Q- Food must be chewed well. A- To break it down into smaller pieces and mix it with saliva, so food can be digested easily . Each of Pharynx and Oesophagus have no digestive functions. 2- Digestion in the Stomach. It is a muscular sac stores food. It has strong muscular walls. The muscles of stomach contract and relax to break down the food into small pieces.

Science For Sixth Primary The Circulatory System. The Circulatory System الدورة الدموية. It is a strong hollow muscular organ , its size is a bout the clenched fist. The two sides are separated from each other by muscular wall to prevent the mixing of the blood between them. They found in the upper part of the heart, they are right atrium and left atrium.

المشرف على الموقع ashraf taha. The structure of living Organisms. Is the building unit of the living organism. It is the building unit of a plant . Un - flexible thick wall , surrounds the cell to protect and support it . It is a clear jelly, fill most of the cell and it is surrounded by a plasimc membrane. It is a dark spherical shaped body. It is surrounded by cytoplasm.