Puzzle Description:

These cyanobacteria are sitting in shallow water, emitting great quantities of gas - oxygen, to be specific. These critters evolved during the end of the Pre-Cambrian period, and threatened to destroy all existing life with their gassy emissions. This was called the Great Oxygen Catastrophe. See the comments to find out how this catastrophe ended up to be a happy thing.

#1: Teresa K (fasstar) on May 19, 2010 [SPOILER]

Watch this very cool video to learn how the Great Oxygen Catastrophe turned out to be a good thing, and how these poisonous cyanobacteria learned to live with plants. They are among us today, and it's a very good thing they are.

http://www.physics.uq.edu.au/people/aggie/blog/?p=180

Teresa-I always learn so much from you! Thank you.

Great puzzle Teresa and thanks for the lesson!

Thanks, Wendy and Susan. Earth History was one of my favorite classes, but I took that so long ago that none of this information was known then, and no one had any workable theories. I find it all so fascinating. And it makes me realize there is just so much more that we don't know, so much yet to be discovered.

It makes one wonder how much has already been lost to history that can no longer be "discovered". We will always be missing some pieces of the puzzle, and can only approximate at best what some of missing pieces are.

True.

I'm always surprised to find a new Teresa puzzle. I thought I'd gone through and solved them all!

Hey, Kristen. I remember doing the "Time" series. :-)

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