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Question
Blood entering the lungs contain very
Options:
A .  little oxygen (O₂) only
B .  high carbon dioxide (CO₂) only
C .  low carbon dioxide (CO₂)
D .  little oxygen (O₂) and high carbon dioxide (CO₂)
Answer: Option D
Answer: (d).little oxygen (O₂) and high carbon dioxide (CO₂)

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