The answer would be the xylem and the pholem
The process by which oxygenreleased into the atmosphere by photosynthetic organisms is taken up by aerobic organisms while the carbon dioxide released as a by-product of repiration is taken up for photosynthesis. Origin ofoxygen cycle Expand.
Breathing source oxygen elements easy to live human
Alleles
I had bio a while ago though so I could be wrong...
