Where does oxygen come from?

February 10, 2007 4:29am CST
Where does oxygen come from?
3 responses
• Malaysia
17 Feb 07
oxygen is from carbon dioxide. This is done by plants.they are the only ones tat take in co2 and release o2. this process is called photosynthesis. the carbn dioxide is taken in and the varous plant cells use this for chemical procceses in their cells using various pathways that take only the carbom atom and release the o2 as a waste product. co2 comes in from he stomata of their leaves and o2 goes out via the same ute but as a waste product.thats why trees are so important.:P
@nicolai (288)
• Philippines
10 Feb 07
It came from the plants,,
• United States
10 Feb 07
We know that oxygen definitely comes from photosynthesis and rain forests do produce a significant but decreasing amount because of all the rainforest destruction.