How is our atmosphere different from the atmospheres on Venus and Mars?

Explanation

To answer the question of how our atmosphere is different from the atmospheres on Venus and Mars, we can break down the comparison into several key points:

### Step 1: Composition of Earth's Atmosphere
- The atmosphere of Earth is a mixture of various gases. The primary components include:
- Nitrogen (approximately 78%)
- Oxygen (approximately 21%)
- Carbon dioxide (approximately 0.04%)
- Water vapor (variable, but typically around 1% on average)
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