The ____________________ that aquatic animals use for gas exchange have evolved several times, but they are always structured to provide the maximum surface area for gas exchange.
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Q43: Bubbles form in a glass of water
Q44: Unlike aquatic organisms, humans have their gas
Q45: The _ contracts in order to pump
Q46: Why do many large animals rely on
Q48: While observing goldfish, you notice that gill
Q49: Gases move from an area of _
Q50: _ is the process of expelling carbon
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Q52: The human _ system is used for
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