Sometime after an event slightly elevating atmospheric oxygen and the already present simple life forms scattered about on Earth...nothing happened. For a billion years.
WTF happened?
Researches now theorize that bacteria utilizing sulfur is to blame. It is theorized that the oceans back then were mostly sulfur, not oxygen allowing these microbes to thrive. Sulfur-oxidizing bacteria do not produce oxygen, which kept the Earth stuck at simple life forms for a while.
However, something must have shifted in order to jump start evolution such as iron being introduced into the oceans by continental shift. About 600 million years later, multicellular lifeforms showed up and eventually evolved to.....Starbucks drinking, twittering, facebook using humans.
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