Which Of These Is The Main Part Of The Air We Breathe?

0
Difficulty
Medium

Which Of These Is The Main Part Of The Air We Breathe?

Question:
Which Of These Is The Main Part Of The Air We Breathe?
a)
Hydrogen
b)
Helium
c)
Calcium
d)
Oxygen

Scroll down to see the correct answer

Correct Answer
Oxygen
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