The process is very well-known in Biology called the Photosynthesis. It plays an role in plants because plants get it energy from sun.
The earths atmosphere is made up of 78% nitrogen and 21% oxygen
97%
no
Oxygen gas
Free oxygen
Plants
oxygen
Nitrogen and oxygen,
no
mostly nitrogen with 21% oxygen
photosynthsis
The earths atmosphere is made up of 78% nitrogen and 21% oxygen