Completar frases RESPIRATORY SYSTEM: COMPLETEVersión en línea PRIMARY SCHOOL. GRADE 4 COMPLETE THE TEXT ABOUT THE RESPIRATORY SYSTEM. por Gonzalo Barral 1 lungs the oxygen respiratory system breathing The group of organs that carry out the function of breathing is : . The organs where oxygen passes from the air into the blood are the : . When our bodies obtain oxygen from the air and release carbon dioxide we call it : . A gas in the air that we need to breathe : .
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