At sea level,O2 makes up about _______ percent of the gas molecules in the air.
A) 1
B) 15
C) 21
D) 70
E) 100
Correct Answer:
Verified
Q1: Breathing provides the body with the oxygen
Q5: Gas exchange in animals always involves
A) lungs.
B)
Q6: If the partial pressure of oxygen in
Q7: The rate at which a gas diffuses
Q8: All animals undergoing cellular respiration must get
Q10: The partial pressure of oxygen in a
Q12: Many tiny _ are believed to breathe
Q13: In your own body,which pathway is an
Q14: Suppose the partial pressure of oxygen is
Q15: Humans have difficulty obtaining enough oxygen while
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