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Fishes gills are designed only to extract oxygen when submerged. There is oxygen in water also, but our lungs cannot extract it.

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How do fish take in oxygen?

The fishes gills are like filters. when water goes in a fish's mouth, it goes through the gills, which filter out the oxygen.


Why is the atmosphere classed as an oxygen atmosphere?

Earth's atmosphere is mainly nitrogen, oxygen, carbon dioxide, and water vapor. Oxygen is the most reactive of these. Oxygen allows all of the life as we know it on earth. Even though oxygen is less than 1/4 of the atmosphere it is the most important part.


Is oxygen always omnipresent on Earth?

Oxygen is not omnipresent on Earth; it makes up about 21% of the Earth's atmosphere. It is produced through processes like photosynthesis by plants and organisms in the oceans. Without these processes, the levels of oxygen on Earth would gradually decline.


What gas was not present in the atmosphere of primitive earth?

Primitive Earth (Before life) contained no or very little Oxygen (element#8)According to scientific theory:Earth had no oxygen to begin with. It had a lot of carbon dioxide, though. Somehow (We still do not know how they started growing) single-celled Carbon Dioxide-breathing bacteria slowly, over thousands to millions of years, turned most carbon dioxide into oxygen, supporting new types of life.:)


Is the atmosphere a layer of gas?

actually it is several layers of gas. its not gas that goes in your car though. but yes. the atmosphere is made up of air and oxygen.


Will oxygen make gravity?

No, oxygen does not create gravity. Gravity is a fundamental force of nature that is caused by the mass of an object. Oxygen is a gas that makes up a significant portion of Earth's atmosphere, but it does not generate gravity itself.


How often does oxygen cycle through the atmosphere?

oxygen is a constant 20 percent throughout the atmosphere. Even in space but the air is so thin in space that the oxygen would have to be compressed to be able to breathe it. Here on earth at sea level the atmospheric pressure is 14.7 pounds per square inch (PSI) making it possible for your body to inhale enough usable oxygen for you to breathe. As you go higher the pressure is less so even though the oxygen is still 20% of the atmosphere there is less atmosphere for you to breathe.


Do any other planets have oxygen?

Earth is the only known planet with an oxygenated atmosphere.


What does air flow through?

the atmosphere on earth is mainly made of oxygen, so it only interacts with the other gases up there. the question is kind of ambiguous, though.


What is the total number of electrons present in a Oxygen?

there are 8 electrons in an oxygen atom, equal to the number of protons. there are 6 valence electrons though, give or take because they constantly switch


What is the main component of Mars' atmosphere?

Mars has an atmosphere, though it is different than our atmosphere here on Earth. The atmosphere of Mars is thin, cold, and dry and contains much less oxygen than the atmosphere of Earth. The oxygen content of the Martian atmosphere is only 0.13 percent, compared with 21 percent in Earth's atmosphere. Carbon dioxide makes up 95.3 percent of the gas in the atmosphere of Mars. It also contains nitrogen and argon and very small amounts of water and methane. Additionally, the atmospheric pressure on Mars is only about 1/100 that of Earth's!


What produces oxygen in antarctica?

Even though not much grows on the Antarctic continent, it is extremely rich in oxygen. From Wikipedia: "Oxygen is the most abundant chemical element by mass in the Earth's biosphere, air, sea and land." Cold water in the Southern Ocean, for example, holds more dissolved oxygen than other bodies of water. The oxygen cycle in general is responsible for supplying oxygen to the Antarctic continent.