Explain in how many ways oxygen is used up from atmosphere and how it is returned back to atmosphere
Answers
Answer:
All animals breathe in oxygen and breathe out carbon-di-oxide. We inhale the air which is a mixture of various gases. This mixture reaches the lungs where oxygen gets absorbed by the blood and carbon-di-oxide from impure blood is released back into the atmosphere through the process of respiration.
We human beings take in that oxygen which we used to break carbohydrates down into energy in a process called respiration. Water is made up of atoms of hydrogen and oxygen. During the process of photosynthesis, the hydrogen is combined with carbon atoms to produce oxygen which is then releases into the atmosphere.
The oft-repeated claim that the Amazon rainforest produces 20% of our planet's oxygen is based on a misunderstanding. In fact nearly all of Earth's breathable oxygen originated in the oceans, and there is enough of it to last for millions of years.