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PLEASE HELP!! Which of these is necessary for gas exchange in the respiratory system? a.At least 30% oxygen in the air b.The exchange surface must be moist c.The air must be cooler than body temperature
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PLEASE HELP!!

Which of these is necessary for gas exchange in the respiratory system?
a.At least 30% oxygen in the air
b.The exchange surface must be moist c.The air must be cooler than body temperature
d.The blood cannot be moving ​

User Pinxue
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1 Answer

2 votes
Most likely A only because your respiratory system needs oxygen
User Ed Brannin
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