How has the efficiency of respiratory surface increased from fishes to.human beings?
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Humans have alveolar sacs present in their lungs so this increases the surface area for xhange of gases and these sace are not present in fetishes
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Breathing is the process of taking in oxygen-rich air and giving out carbon dioxide-rich air. Breathing in is 'inhalation' and breathing out is 'exhalation'. ... This happens because when air enters, the lungs expand and the ribs move outwards. Simultaneously, the diaphragm contracts and becomes flat.
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