The invisible thing that we use everyday.

You may not even be aware of it but as you read this you are breathing in oxygen. You cannot see it but it is there. And a good job it is too because without it there would be no life on Earth. All living things, be they animal or plant, all need oxygen. Even fish and underwater plants. They take the dissolved oxygen in the water out and into their bodies. Image credit Like natural gas or coal we use oxygen as a fuel. Just like a boiler in…

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