2007-04-11 15:09:33 · 8 answers · asked by diaM 1 in Science & Mathematics ➔ Earth Sciences & Geology
Photosynthesis of CO2 with water to form sugar. O2 is a product.
2007-04-11 15:13:40 · answer #1 · answered by cattbarf 7 · 0⤊ 0⤋
Below is an excerpt from
http://www.wisegeek.com/where-does-atmospheric-oxygen-come-from.htm
There's more but it will not fit in these answer panes so I suggest you take a look at the site. I found it very interesting.
The sources of atmospheric oxygen through photosynthesis are cyanobacteria and plankton in the ocean, and trees on land. The amount of atmospheric oxygen that each source contributes is under debate: some scientists suggest that over half of the world's atmospheric oxygen comes from oceans, for example, while others put the number at closer to one third. What is clear is that the numbers have fluctuated over the centuries, depending on the balance of life on Earth. When the atmosphere was first developing, for example, cyanobacteria contributed the majority of atmospheric oxygen.
2007-04-11 15:26:15 · answer #2 · answered by Anonymous · 0⤊ 0⤋
Plants
2007-04-11 16:08:48 · answer #3 · answered by Rachael W 2 · 0⤊ 0⤋
Plants
2007-04-11 15:19:21 · answer #4 · answered by Anonymous · 0⤊ 0⤋
Stromatolites were supposedly a major oxygen producer.
2016-05-17 23:22:40 · answer #5 · answered by leta 3 · 0⤊ 0⤋
Al Gore
2007-04-11 15:18:38 · answer #6 · answered by Frank 4 · 0⤊ 0⤋
The green algae in the ocean.
2007-04-11 15:15:37 · answer #7 · answered by xjtoolx 1 · 1⤊ 0⤋
the photosynthesis process performed by plants and algee.
2007-04-11 15:14:11 · answer #8 · answered by Jimmy D 1 · 0⤊ 0⤋