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Protein Domain is a conserved part of a given protein sequence and (tertiary) structure that can evolve, function, and exist independently of the rest of the protein chain. Prior to the Cambrian explosion, most organisms were simple, composed of individual cells occasionally organized into colonies.
Ocean organisms and primitive animals start to evolve.(3.9 Billion Years since the Birth of Earth, and 2.9 Billion Years since Microorganisms Formed)The earth was completely covered in Ice.Snowball Earth Choanoflagellate are a group of free-living unicellular and colonial flagellate eukaryotes considered to be the closest living relatives of the animals.The Scale of the Universe from Big to Small (youtube) The Scale of the Universe from Small to Big (youtube) NASA Astronomy Picture of the Day (APOD) The Scale of the Universe - Interactive (manual control scale) Sizes (nano) Stars and Galaxies started to form.
Reionization marks the point at which the hydrogen in the Universe became ionized.Pangaea started braking apart about 200 million years ago.