I believe that I can end this debate. I JHAP being of sound mind do solemnly swear that I saw a TV program on the discovery channel in which it was clearly stated that 70 to 80 percent of Earths oxygen came from algae. It was on the Discovery channel so it must be true. I would have posted this factoid earlier (in fact I considered posting a thread on it after seeing the Discovery special) but I lapsed into an episode of dimentsia and forgot. 'Course now one of you scientific types are probably gonna point out that this has nothing to do with DO in a pond and that I should go back to drawing pictures of cows but Hey, I gave it a shot.

JHAP
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"My mind is a raging torrent, flooded with rivulets of thought cascading into a waterfall of creative alternatives."
...Hedley Lamarr (that's Hedley not Hedy)