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Q: A mammal uses only 1 to 2 percent of its energy in ventilation while a fish must spend?
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A mammal uses only 1 to 2 percent of its energy in ventilation while a fish must spend about 15 percent of its energy to move water over its gills Explain this huge difference?

i think it because in water oxygen dissolved in the water and it is harder than oxygen concentration in the air.


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Is a polar bear a marine mammal or any kind of mammal?

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