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 ​

1 answer
Question:

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 ​

Answers

Most likely A only because your respiratory system needs oxygen

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