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

Explanation

On the planet Venus and Mars carbon dioxide forms the major component constituting upto 95-97% of the atmosphere. No life is known to exist there. On the contrary, on the Earth, air forms the blanket around the Earth having nitrogen (78.08%), Oxygen (20.92%), carbon dioxide (0.03%), argon (0.93%) and trace components (0.04%). It has life on it.