(2,500MYA - 550MYA)
The Proterozoic Eon begins with an ocean teeming with bacteria around 2.5
Billion years ago. Algae
arose next, 1.5 Billion
years ago. Algae is the first single cell
to have its own nucleus. Cells with a nucleus are called
eukaryotic in the
Eventually, 1 Billion years ago, these single algae cells grew together in masses -
multi-cellular organisms, the first aquatic plants, leading us into the Phanerozoic
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