1) Which gas does blood take from the lungs? a) nitrogen b) carbon dioxide c) oxygen d) hydrogen 2) Which of these organs removes waste material? a) heart b) kidneys c) stomach d) brain 3) Which of these damages the liver? a) smoking b) exercise c) eating sweets d) drinking alcohol 4) What is the lower chamber of the heart called? a) ventricle b) atrium c) air sac d) capillary 5) Where does digestion take place? a) lungs b) stomach c) kidney d) liver

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