1) What is the largest organ in our body? a) liver b) skin c) heart 2) Which organ pumps blood? a) heart b) Liver c) kidney 3) It supplies oxygen and nutrients to your whole body and remove waste through your blood. a) respiratory system b) circulatory system c) skeletal system 4) what does C02 stands for? a) nitrogen b) carbon dioxide c) oxygen 5) Which system is the one who digest the food we eat? a) digestive system b) circulatory system c) respiratory system

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