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7. a)
Tiny air sacs at the end of the bronchioles (tiny branches of air tubes in the lungs). The alveoli are where the lungs and the blood exchange oxygen and carbon dioxide during the process of breathing in and breathing out.
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7. a) We find Alveoli in our Lungs.
b) Blue colour represent the Artery and Red colour represent the vein.
6. The Test tube C will have the highest concentration of Carbon Dioxide because it contains both plant and snail so more Carbon dioxide will be released.
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