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If you're talking about the level in the air, which I assume you are, it's because as we exhale, the oxygen we inhaled is replaced with carbon dioxide, which trees "breathe" in. Trees, or any plant, then releases oxygen after it completes photosynthesis with the carbon dioxide.
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Why does the nitrogen level in the atmosphere is higher than the oxygen level?
Because due to the over pollution and cutting down the tree's level of Oxygen is decreasing .The level of Nitrogen always remains constant in the atmosphere . The level of Nitrogen doesn't' depend on the level of the Oxygen level.
How can you keep the oxygen level constant in the air?
It is because there is a lot of trees around us and it gives out oxygen for us during photosynthesis.
How are gases and water levels kept constant?
when the earth is kept at a good level then they stay the same but if the levels a too high there is a good possiblity and they can be constant :)
What group of prokaryotes are organisms that require a constant supply of oxygen?
organisms that require a constant supply of oxygen from the prokaryotic group are called "obligate aerobes
What happens to the oxygen level at high altitudes?
the oxygen level decreases
Why does the nitrogen level in the atmosphere is higher than the oxygen level?
Because due to the over pollution and cutting down the tree's level of Oxygen is decreasing .The level of Nitrogen always remains constant in the atmosphere . The level of Nitrogen doesn't' depend on the level of the Oxygen level.
Why is it important for your blood pressure to stay at a constant level?
Keeping your blood pressure at a relatively constant level is likely to prevent strokes and other vascular accidents.
How can you keep the oxygen level constant in the air?
It is because there is a lot of trees around us and it gives out oxygen for us during photosynthesis.
How are gases and water levels kept constant?
when the earth is kept at a good level then they stay the same but if the levels a too high there is a good possiblity and they can be constant :)
If balanced forces act on a person what does that mean about their motion?
It means they stay still, or they move at constant velocity.It means they stay still, or they move at constant velocity.It means they stay still, or they move at constant velocity.It means they stay still, or they move at constant velocity.
How do sea anemones get air?
Their tendrils wave in the water and "filter feed" the oxygen out of the water. This means they need constant motion to stay alive much like barnacles which latch onto whales and other ocean life to have this constant motion.
What group of prokaryotes are organisms that require a constant supply of oxygen?
organisms that require a constant supply of oxygen from the prokaryotic group are called "obligate aerobes
What happens to the oxygen level at high altitudes?
the oxygen level decreases
What are oxygen levels highest and lowest?
Oxygen's highest level is 100%. Oxygen's lowest level would be 20%.
What is non constant speed?
non-constant speed is when the speed for an object does not stay the same
What is non-constant speed?
non-constant speed is when the speed for an object does not stay the same
Is water oxygen constant temperature a abotic?
abiotic
