BC 2,100,000,000
The earliest form of multicellular life is busy growing today, like all days, in what will become Gabon. The Gabon Macrofossilsillan Biotaer, which will be named after the future Gabon city where their fossils will be located in the 21st Century by Moroccan geologist Abderrazak El Albani, are flattened 17-cm wide discs that live on land and whose cells somehow communicate to achieve coordinated growth.