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Reply #2


Response to MrScorpio (Original post)

Sat Apr 13, 2013, 01:51 PM

2. Thank the ancient stramatolites!

All the way back 3.5 billion years ago they started changing a large portion of the CO2 in our atmosphere to O2.

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Arrow 12 replies Author Time Post
MrScorpio Apr 2013 OP
tblue37 Apr 2013 #1
LineReply Thank the ancient stramatolites!
jimlup Apr 2013 #2
Xipe Totec Apr 2013 #7
ErikJ Apr 2013 #10
jimlup Apr 2013 #11
Cooley Hurd Apr 2013 #3
Spitfire of ATJ Apr 2013 #4
Cooley Hurd Apr 2013 #5
Spitfire of ATJ Apr 2013 #6
valerief Apr 2013 #8
Cooley Hurd Apr 2013 #9
SeattleVet Apr 2013 #12
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