2006-12-05 05:32:26 · 2 answers · asked by Kayla 1 in Environment
"The composition of the atmosphere has continued to slowly change, mostly due to the increase of oxygen produced by photosynthetic algae floating on the ocean. By the Paleozoic, the composition of the air has reached something like what we breathe now: about 4/5 nitrogen, 1/5 oxygen, and small amounts of carbon dioxide, water vapor, and other gases. At long last the air is capable of supporting large animals, and almost in response, life explodes into the Paleozoic!"
Check the link below for more information, or search on "atmosphere paleozoic" (with the correct spelling!).
2006-12-05 06:01:30 · answer #1 · answered by Yahzmin ♥♥ 4ever 7 · 0⤊ 0⤋
An article in Nature magazine in late September or early October addresses the varying concentration of CO2 over time. Check out the scene at a suitable library.
2006-12-05 13:36:06 · answer #2 · answered by Anonymous · 0⤊ 0⤋