trees and kelp because trees take in the dirty oxygen and puts out the clean oxygen and the kelp i was researching kelp and i saw that kelp helps and makes oxygen.
Joseph Priestley experimented to show that plants make oxygen.
Water does not make oxygen in plants.
Plants make oxygen for us a living.
oxygen
oxygen
The y have to have carbon dioxide to make oxygen
Oxygen
threw photosynthysis
OXYGEN
oxygen
oxygen
Photosynthesis.