Sentences with phrase «occurring organic chemical compound»

Not exact matches

But before life arose, nitrogen fixation must have occurred via purely chemical means: That's because amino acids and nucleic acids, which both contain nitrogen, were likely the organic compounds that developed into Earth's first lifeforms.

Ozone is an odorless gas that is not directly emitted into the air but is created by chemical reactions between nitrogen oxides (NOx) and volatile organic compounds (VOC)-- which occur naturally but are also produced from the burning of fossil fuels and are released in the process of drilling for oil and natural gas.