2. Which internal organ is protected inside our ribcage?
(iii) kidney
(i) heart
(ii) liver
3. The process of breathing is called
(i) circulation
(iii) respiration
(ii) reproduction
4. The air that we inhale contains
(i) carbon dioxide
(ii) oxygen
(iii) nitrogen
5. Which of these cause air pollution?
(i) smoke
(ii) harmful gases
(ii) both (i) & (ii)
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