Subtitle Forum: Is the Oxygen Still 21%?
The answer to this question is yes, the oxygen level in Earth's atmosphere is still 21%. This is a very important number, as oxygen is essential for all life on Earth. Without it, no living thing could survive.
Oxygen is a gas that makes up about 21% of Earth's atmosphere. It is produced by plants during photosynthesis, and then taken in by animals and other organisms during respiration. Oxygen is also necessary for the burning of fuels.
The amount of oxygen in the atmosphere has remained stable for thousands of years. This is due to a balance between the amount of oxygen produced by plants and the amount used up by animals and other organisms. This balance is affected by climate change and other human activities, such as burning fossil fuels.
However, scientists are keeping a close eye on the amount of oxygen in Earth's atmosphere. If it drops too low, it could have serious consequences for all life on Earth.
Photosynthesis is the process by which plants produce oxygen as a by-product of converting light energy into food energy. Plants take in carbon dioxide and use light energy to convert it into sugars and oxygen. This process also removes carbon dioxide from the atmosphere.
Respiration is the process by which animals and other organisms convert food energy into energy that can be used for growth and movement. During respiration, oxygen is taken in and carbon dioxide is released. This process adds oxygen to the atmosphere and removes carbon dioxide.
Fossil fuels are hydrocarbons such as coal, oil, and natural gas that were formed over millions of years from the remains of plants and animals. When these fuels are burned, they release carbon dioxide and other pollutants into the atmosphere. This process reduces the amount of oxygen in the atmosphere.
