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When fish breathe, their gills exchange oxygen and ___________. a. carbon dioxide c. carbon monoxide b. nitrogen d. only oxygen is exchanged?
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When fish breathe, their gills exchange oxygen and ___________.

a. carbon dioxide
c. carbon monoxide
b. nitrogen
d. only oxygen is exchanged?

User Acemtp
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1 Answer

3 votes
C. carbon monoxide is the answer
User MontiRabbit
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