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#1 2017-10-20 14:08:55
- shakeel123
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Which of the following gas is essential for human?
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Question:
Which of the following gas is essential for human?
Option A):
Oxygen
Option B):
Nitrogen
Option C):
Carbon Dioxide
Option D):
None of these
Correct Answer is Option A):
Oxygen
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Re: Which of the following gas is essential for human?
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