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Assessment
What is the primary gas that fish use for respiration?
Oxygen
Carbon Dioxide
Nitrogen
Hydrogen
Which structure in fish is primarily responsible for the exchange of gases?
Gills
Lungs
Swim Bladder
Heart
How do fish regulate their oxygen intake when the water is low in oxygen?
By increasing gill surface area
By swimming faster
By opening their mouths wider
By coming to the surface to gulp air
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