false
Without life because when plants do photosynthesis, they produce oxygen.
The earths atmosphere is made up of 78% nitrogen and 21% oxygen
97%
no
Free oxygen
Oxygen gas
Plants
oxygen
Earths atmosphere is rich in Oxygen, some 21% of the air is Oxygen. There is oxygen on other planets, but the percentage comes nowhere close to this. The percentage of Oxygen in earths atmosphere is thought to have been much higher in the past, before animals were about, but after the arrival of plants.
mostly nitrogen with 21% oxygen
no
Nitrogen and oxygen,