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12 h, dec 18, 2017 y - First Vertebrates (creatures with backbones)
Description:
The first animals with backbones came into existence
Added to timeline:
12 Dec 2017
0
0
294
Cosmic Calender
Earth and Space P6
Date:
12 h, dec 18, 2017 y
Now
~ 6 years and 4 months ago
Images: