Question

All living things breathe in oxygen. But the percentage in oxygen in the air does not decrease. Why?

Answer 1

⏺heya friend !

✔here's your answer :-

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1.80% of the world's gas oxygen is produced by phytoplankton and marine plants.

2.As the world's water level rises, more plants will have room to grow. Hence the oxygen amount will stay the same even if trees are killed and deserts increase.

 3. And the more  CO2 we pump out, the more for the phytoplankton and marine plants to convert. Hence where the percent Oxygen remains the same.  

4.You also have to know that oxygen is one of the most abundant chemical elements on Earth.  

➡that is why the oxygen level in the atmosphere do not decrease.

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i hope it helps u !!!☺

Answer 2

Heya user!!

Plants also give oxygen into the atmosphere.

Hope it helps