Why does the percentage of gases like oxygen, nitrogen and carbon dioxide remain almost the same in the atmosphere?

Explanation

### Step-by-Step Solution:

1. **Understanding the Composition of the Atmosphere**:
- The atmosphere is composed of various gases, with nitrogen making up approximately 78%, oxygen about 21%, and carbon dioxide around 0.04% (or 1% when considering other trace gases).

2. **Cyclic Flow of Gases**:
- The percentage of these gases remains relatively constant due to their cyclic flow in nature. This means that there are natural processes that continuously recycle these gases.

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