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That number sounds like the onset of the eukaryote organisms. Single cell, membrane bound nucleus and many membrane bound organelles that probably arose by endosymbiosis.

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12y ago
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5mo ago

1.2 billion years ago, organisms experienced significant changes such as the development of multicellularity in certain lineages and the emergence of more complex forms of life. This period marked the diversification of eukaryotic organisms, leading to the evolution of various new body plans and adaptations. Additionally, the first evidence of sexual reproduction and the appearance of eukaryotic algae and fungi occurred during this time.

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Q: How did organisms change 1.2 billion years ago?
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