Biology
Grade-8
Easy
Question
_________ percentage of oxygen is present in the atmosphere.
- 71%
- 75%
- 25%
- 21%
Hint:
21 percentage of oxygen is present in the atmosphere.
The correct answer is: 21%
- Our atmosphere is made up of different types of gases.
- Among them, 78% is nitrogen, 21% is oxygen and 1% is other gases.
- In this 1%, 0.04% is carbon dioxide.
- There are also trace elements in the atmosphere.
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