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Depends on the animal, fish take dissolved O2 from water, while terrestrial creatures may take O2 directly from the air.
Note that some aquatic organisms may utilize O2 in air simply by trapping an air bubble from which it can extract O2 from, however the reverse it not usually true (aquatic organisms utilizing air O2), with the strange exception of the lungfish (but the lungfish has both sets of O2 extracting systems, one for water and one for air).
Wiki User
∙ 15y ago
Wiki User
∙ 9y agoIt is very likely that phytoplankton is the most important source of oxygen on earth. It supplies about 50 percent of the planet's supply.
Wiki User
∙ 11y agoThere are many sources of oxygen, but a few are the breathing of plants and animals and the decomposition of dead plant and animal material.
Wiki User
∙ 14y agoThe major sources of oxygen...are plants because without them we wouldn't have enough oxygen to start with..
Wiki User
∙ 9y agoFrom the air you breathe (external environment).
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What freshwater source is most important to people?
Rivers, underground water sources, most lakes and reservoirs are the most important freshwater source for people.
What is the most important element found on Earth?
oxygen
The most important source of sodium chloride is sea water?
no.
A major source of oxygen for the Earth's atmosphere is?
Plants photosynthesise to produce oxygen. They also act as a carbon sink. I suppose the largest source of oxygen on Earth is the Amazon forest in South America. Amazon forest is five and a half million square kilometers (1.4 billion acres) big. It is currently the world's most important carbon sink. The Amazon forest is estimated to produce 20% of the world's oxygen supply, excluding all the other plants (e.g. grass). For that, I suppose this is the largest source of oxygen on our planet.
What is the source of oxygen in home treatment?
In the home, the oxygen source is usually a canister or air compressor.
What is the body most important source energy?
energy, oxygen
What is the number one energy source in the oxygen carbon dioxide cycle?
Sunlight is the most important energy source in an oxygen carbon dioxide life cycle.
Are Diatoms important source of oxygen?
Yes they are; diatoms are the main source of oxygen in the universe.
Most important element in oxygen group?
The most important is the oxygen.
What is the most important fact about Oxygen?
oxygen is most important use is for breathing
What is the most important source of capital for business expansion?
what is the most important source
What is the most important energy source?
The Sun is the main and most important energy source.
Which is the most important gas?
The most important gas is oxygen.
Why is led most important source of light?
LED is not the most important source of light, the Sun is.
What makes plants important to people?
Source of food and oxygen. No plants, no life.
What was considered the most important source of knowledge during the cultural revolution?
The most important source was the little red book
Which fresh water source is most important to people?
The fresh water source that is important to people depends on the nation. In the United States the most important freshwater source is the Great Lakes system.
