What is the significance of carbon dioxide in respiration?
A. Carbon dioxide is a waste product that has no role in respiration.
B. Carbon dioxide is used to create energy in the form of ATP.
C. Carbon dioxide is only produced during exercise and not at rest.
D. Carbon dioxide is significant in respiration as it regulates breathing and maintains blood pH.
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How do fish breathe underwater?
A. Fish breathe underwater using gills to extract oxygen from water.
B. Fish breathe through their skin to absorb oxygen.
C. Fish extract oxygen from the surface of the water.
D. Fish use lungs to breathe air like mammals.
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