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Once all the free iron on Earth had reacted with the oxygen that cyanobacteria were making, there was nothing left to capture that oxygen, and it built up in the atmosphere very rapidly.
But because oxygen is so reactive, it was actually poisonous to many organisms that hadn't evolved to handle it (antioxidants are still important even for us oxygen breathers - we don't want extra, unaccounted for oxygen running amock in our cells).
Okay, so now let's start going through the calendar.
Keep in mind that a lot of these time periods and dates aren't known exactly, so in our 4.5 billion year year, they may have really been a few days or even weeks earlier or later.
Day 301, October 28 (800 MYA) The first multicellular life appeared.
Colonies of eukaryotes (and prokaryotes) would have been around before this, but these were the first eukaryotes to nudge past the distinction between a colony of clones and a group of clones considered a single organism.
Since oxygen is so reactive, at first any oxygen these cyanobacteria created would have reacted with iron to make rust.
Keep those numbers in mind - 0.3 seconds for 40 years, 1 second for 150 years, or 14 seconds for 2000 years.
For the next 5 months or so, until August 3rd, these archaea and bacteria will reign supreme as the only type of life on the planet.
Of course, they were evolving - replicating, mutating, and adapting, but they remained prokaryotes.
Days 41 - 57, February 11 - February 26 (4.0 - 3.8 BYA) There were still a lot of asteroids out there at this point, so for roughly another two weeks, the Earth continued to get pummeled by these bodies, in what's known as the Late Heavy Bombardment.
Some time during those two weeks, the very first life got started.
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(It's not a big difference, but let's use a 365 day year, not a leap year.) Let's start off by calibrating ourselves to something we're used to. Learning to walk, ride a bike, drive, my first job, my wedding day, watching my daughter grow up and graduate from high school.