Yes, molecular oxygen makes up about 20% of the atmosphere at sea level.
The atmosphere is 79.9% oxygen.
Oxygen is important because us humans have to breath and our brain have to function.
The moon has no oxygen because it has no atmosphere.
Yes, trees do provide most of our oxygen for the atmosphere
The environment is what you live in. Part of the environment is the atmosphere and this contains Oxygen. In respiration you breath in the atmosphere and get the Oxygen you need from it.
The atmosphere of the Earth is a gas, not a liquid, and although it does contain oxygen, that is just one part of the atmosphere, which is mostly nitrogen.
Earth's atmosphere is mainly nitrogen, oxygen, carbon dioxide, and water vapor. Oxygen is the most reactive of these. Oxygen allows all of the life as we know it on earth. Even though oxygen is less than 1/4 of the atmosphere it is the most important part.
Oxygen, now about 20% of the atmosphere, was not part of the original atmosphere of hthe Earth. It was produced by plants, after life developed.
Obtained by Earths atmosphere which is 20% Oxygen and processed by the aveoli (part of the lung).
Oxygen is necessary for most organisms to carry out their life functions.
The amount of oxygen released into the atmosphere has not noticeably increased in recent years. The amount of oxygen (O2) in the atmosphere is about 21%. It is part of the earth's oxygen cycle, the main driver of which is photosynthesis. Vegetation removes carbon dioxide (CO2) from the atmosphere, releases the oxygen (O2) and stores the carbon (C).
Oxygen cycle is at ground level. Ozone layer is in atmosphere.
Oxygen is part of the mixture of gases we breath. Therefore, burning wood uses the oxygen in the atmosphere.