It is found in combustion fumes (by cars and trucks), portable generators, wood burning stoves, gas ranges and heating systems.
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Answer:
After the blood leaves the right side of the heart it goes into the pulmonary artery and into the lungs.
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Here's a hyperlink
https://www.brainpickings.org/2012/09/17/the-meaning-of-life/
Is tax to be paid or an amount of money should be paid.
Google.