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There are some controversies related to law that bans slaughtering of cows in India. And one argument arousing there is that cows can release oxygen while they breathe out. What's the actual science behind this argument? Is it true? Can cows release oxygen?
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It is impossible for cow to exhale oxygen. Every animal including cow breath in oxygen and breath out CO2 as respiration gaseous exchange. The CO2 is used by plants through what is known as photosynthesis in manufacturing their foods while  the bye product of this process is been released by these plants as oxygen which animals use for their respiratory processes.

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This is a really interesting story. Haven't heard of this one. I think it is true that cows exhale a certain amount of oxygen. Come to think of it, I don't think there really is a 100% efficient system. There will always be losses and inefficiencies. In fact, this happens to humans as well. We breathe in some 20% of oxygen and breathe out 15% of it.
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No, cows do not exhale oxygen. Cows, like all other animals, exhale carbon dioxide when they breathe out. Plants, on the other hand, absorb carbon dioxide and release oxygen as a result of photosynthesis. Therefore, cows are not capable of releasing oxygen.

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Best answer

Yes cows really exhale oxygen, and so do all the mammals including human beings.

Cows do not produce oxygen - they are animals, not plants.  Cows, like all other animals, use oxygen and exhale carbon dioxide.  However, the lungs of any animal are not efficient at removing all oxygen from air, so some oxygen that was not absorbed is exhaled.  This is why mouth-to-mouth resuscitation works.

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Cows like all the mammals,they take out carbon dioxide and breath in oxygen.Or maybe exhale is the word bringing in contusion. Exhale is the process whereby organisms breath out/release carbon  dioxide whereas inhale is the process by which organisms take in oxygen and release carbon dioxide.

The only organisms that use carbon dioxide are plants and they use it to make food for the animals.
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I like this law in India that you can't slaughter cows. I think it is wrong to raise and slaughter most animals. Animals are beneficial for the existence of the earth and our surrounding. Furthermore, a cow can help the oxygen levels in the air that we all breath. It is a known fact that a cow will breathe in more oxygen that it can actually use, therefore, it has to exhale the excess oxygen it has taken in. This helps to replenish the oxygen around us. Considering humans are destroying so much of the forests and plant life this makes it harder and harder to replenish the oxygen that everyone breathes. So leave the cows alone and let them help replenish the oxygen. They always take in way more than they can use so they are always happy to give us some back. 
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Instead of claiming cows exhale oxygen to restrict slaughtering of cow Indian government should look for a good excuse.
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If you are talking about Jercy Cow, it won't; there is no knowledge of Jercy Cow which is actually made out of Pig's DNA. Indegenious Cows do, they do not pollute the air, oxygen taken by them is returned back naturally.

As for the law, it is due to different reason, if you remember history, then you might remember that Cow slaugather was prohibited even in Bagdad because Cows were considered most important.
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Cows are part of Mammals, they inhale oxygen and exhales carbon dioxide like humans.

 

But, if we see, in our atmosphere there are many gases which we inhale with oxygen like nitrogen, carbon dioxide, and other gases while our lungs absorb only oxygen and exhale other gases through our mouth which also includes some percentage of oxygen. So, we can't say that animals (including humans) don't exhale oxygen. 
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If you explain very clear in your first paragraph, that's enough bro.cows inhale oxygen and exhale carbon dioxide.
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Most of the living thing exhale Carbon dioxide with the residual of oxygen which also include cow too. So their are many microorganism which exhale oxygen 
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No.The exhale carbon dioxide just like human beings .Most of the living creatures will exhale carbon dioxide while they inhale oxygen.The same is with most mammals on Earth.
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The experts claimed that cows are the only animals that inspire oxygen and expire carbon dioxide. It sounds like they are like humans.
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Yes, it is. Cow can exhale oxygen. It is true. I didnt knows the science behind it. Hindus believes that god exists inside a cow. So they are saying not to kill cows. 
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For allow the living things to survive ,there should be oxygen gas . the correct answer is No because it inhale oxygen which is used in the process of respiration and Carbon iv oxide is exhale is the waste product

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The cows don't exhale oxygen. It was only a political statement made by Judge of Allahabad high court Justice Shekhar Kumar Yadav. He wanted cows to be the national animal of India so, he gave this statement to validate his claim.
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The fact is all living organisms breathe in oxygen and breathe out carbon dioxide while plants take in carbon dioxide removed from human being and release oxygen required by human being.
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There is no scientific evidence that suggests that cows can release oxygen while they breathe out. The argument that cows are able to exhale oxygen is based on a few isolated cases of it being so claimed. If cows are able to exhale oxygen, it would mean that they were emitting enough oxygen for humans to release it into the environment. Unfortunately, there is no scientific consensus on the matter.
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No, cows do not exhale oxygen. Like all other animals, cows inhale oxygen and exhale carbon dioxide as part of the process of respiration. Plants, on the other hand, release oxygen into the atmosphere through a process called photosynthesis, where they convert carbon dioxide and sunlight into energy and oxygen.
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We exhale carbon dioxide and other gases along with the residual oxygen. This process stands same for all living beings, including cow." According to Encyclopaedia Britannica,"Respiratory system is the system in living organisms that takes up oxygen and discharges carbon dioxide in order to satisfy energy requirements.
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