Oxygenic photosynthesis...
    provides the energy to run the 'factory' that processes carbon dioxide in order to provide oxygen for the atmosphere.



Ponder exercise...
when did the chloriphyl plants show up? Where did the Carbon dioxide come from.  Where did the water get the oxygen to becom H2O? 

It all was created instantly... but that word implies time-space, but thad did not exist yet.  There is no "measuting stick" of time until after the "moment of creation". Not all galixies and universes have the same time base. Just how "long' is an 'instant'?

Until we can disconnect our mind, emotions and will from "the clock", we can't "get it!"

Astronomy Magazine, June 2014