oxygen producing organisms
Earths atmosphere dose have oxygen in it, without it we would all be dead we require oxygen to breathe.
The amount of oxygen in the atmosphere increased because the number of photosynthetic organisms, which release oxygen, on the earth dramatically increased. This lead to the Great Oxygenation Event, or the Oxygen Crisis, 2.4 billion years ago - when this free O2 entered the Earth's atmosphere.
oxygen
The Earths atmosphere protects the earth from meteors and it tgives us oxygen
Nitrogen makes up 78% of the earths atmosphere Oxygen makes up 21% of the earths atmosphere
oxygen producing organisms
Earths atmosphere dose have oxygen in it, without it we would all be dead we require oxygen to breathe.
The earths atmosphere is made up of 78% nitrogen and 21% oxygen
The amount of oxygen in the atmosphere increased because the number of photosynthetic organisms, which release oxygen, on the earth dramatically increased. This lead to the Great Oxygenation Event, or the Oxygen Crisis, 2.4 billion years ago - when this free O2 entered the Earth's atmosphere.
no
97%
oxygen
yes
The Earths atmosphere protects the earth from meteors and it tgives us oxygen
Nitrogen makes up 78% of the earths atmosphere Oxygen makes up 21% of the earths atmosphere
Free oxygen
Gasses found in Earths atmosphere.