The first evidence of fossil life on Earth appears 3.5 billion years ago; these bacteria-like micro- fossils dominate for nearly 1.5 billion years, then 2 billion years ago eukaryotic cells that resemble modern "protozoa" and "protophyta" appear. What is the most widely accepted scientific hypothesis for the rather sudden appearance of Protista-type organisms on Earth? What evolutionary mechanism is responsible for this sudden plyletic change? Provide 3 specific examples of evidence that support this hypothesis.

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