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Politics : Stockman Scott's Political Debate Porch -- Ignore unavailable to you. Want to Upgrade?

To: T L Comiskey who wrote (34506)	1/8/2004 5:23:25 PM
From: TigerPaw	Read Replies (1) \| Respond to of 89467

The largest extinction was another case of global air pollution. ersdac.or.jp <font color=olive> Organisms, which had lived on earth without oxygen, could no longer exist ever since oxygen was added in the atmosphere. Because once oxygen intrudes in cells of their body, all the components start to dissolve by oxidization. In other words, for creatures, which did not have mitochondria, oxygen worked as a highly toxic substance. More than 2 billion years ago, sudden generation of oxygen caused by irruption of cyanobacteria triggered an extensive destruction to earth's environment. Global scaled pollution by oxygen resulted in massive extinction of species. </font> TP