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How Life Began on Earth
#5
RE: How Life Began on Earth
[Image: 840px-Oxygenation-atm-2.svg.png]

Graphical form of what Anomalocaris said.  From Wikipedia page on "Great Oxygenation Event".  Essentially, life started over 3 billion years ago (maybe 3.5ish?) but O2 certainly wasn't around until 2.5 bya at the earliest, and didn't reach today's levels until relatively recently in the geological timescale

(In the picture the red and green are the upper and lower bounds, respectively, of the estimated oxygen concentration)
How will we know, when the morning comes, we are still human? - 2D

Don't worry, my friend.  If this be the end, then so shall it be.
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Messages In This Thread
How Life Began on Earth - by Rhondazvous - January 4, 2016 at 3:09 pm
RE: How Life Began on Earth - by Kingpin - January 4, 2016 at 3:15 pm
RE: How Life Began on Earth - by vorlon13 - January 4, 2016 at 3:54 pm
RE: How Life Began on Earth - by Anomalocaris - January 4, 2016 at 4:47 pm
RE: How Life Began on Earth - by TheRealJoeFish - January 4, 2016 at 5:21 pm
RE: How Life Began on Earth - by Rhondazvous - January 10, 2016 at 4:10 pm
RE: How Life Began on Earth - by Gawdzilla - January 10, 2016 at 4:53 pm
RE: How Life Began on Earth - by Minimalist - January 10, 2016 at 5:28 pm
RE: How Life Began on Earth - by Gawdzilla - January 10, 2016 at 6:41 pm
RE: How Life Began on Earth - by The Grand Nudger - January 10, 2016 at 5:29 pm
RE: How Life Began on Earth - by Rhondazvous - January 10, 2016 at 6:20 pm
RE: How Life Began on Earth - by The Grand Nudger - January 12, 2016 at 5:31 am

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