Earth
Earth
Earth.
The closest match to this is Earth with about 21%. No other known planet has more than a trace of free oxygen.
Oxygen makes up about 20% of Earth's atmosphere.
The Earth has an atmosphere of 78% nitrogen (and 21% oxygen).
Earth.
Earth
The closest match to this is Earth with about 21%. No other known planet has more than a trace of free oxygen.
Earth... my favorite
oxygen
Oxygen
The Earth
Neptune (NovaNet) There's something wrong here. Neptune is mainly a hydrogen atmosphere. Earth is the planet with a mainly nitrogen atmosphere, but the coldest is Neptune.
Approximately 20 percent of the Earth's atmosphere is made up of oxygen.
Oxygen
Oxygen
Oxygen