1. define respiration.mention two types of respiration
2. draw the four types of teeth and mention one function of each.
3. write the. functions of saliva.
4 what are plastids? name the three kinds
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In physiology, respiration is the movement of oxygen from the outside environment to the cells within tissues, and the removal of carbon dioxide in the opposite direction. ... In contrast, exhalation (breathing out) is usually a passive process.
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