what advantage over an aquatic animal does a terrestrial organism have with regard to obtaining oxygen for respiration?
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Terrestrial organisms take up oxygen from the atmosphere whereas aquatic animals obtain oxygen from water. Air contains more O2 as compared to water. Since the content of O2 in the air is high, the terrestrial animals do not have to breathe faster to get more oxygen.
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Animals living in water need use the oxygen dissolved in water. However the amount of dissolved oxygen is fairly low compared to the amount of oxygen in the air. Hence, the aquatic organisms has much faster rate of breathing. ... Thus terrestrial organisms can facilitate better utilization of food by way of respiration.
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