Four radioisotopes commonly used radiometric dating
By 600 million years ago, the oxygen in the atmosphere reached about one-fifth of today’s level (21 percent).(3.9 Billion Years since the Birth of Earth, and 2.9 Billion Years since Microorganisms Formed) Multicellular Organisms appear that consist of more than one cell, in contrast to unicellular organisms, which is an organism that consists of only one cell. Multicellularity has evolved independently at least 46 times. Snowball Earth Choanoflagellate are a group of free-living unicellular and colonial flagellate eukaryotes considered to be the closest living relatives of the animals.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.Over the following 70 to 80 million years, the rate of diversification accelerated by an order of magnitude and the diversity of life began to resemble that of today.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) It is believed that our Universe began.(Not sure if it was the first time or even the beginning of time? Reionization marks the point at which the hydrogen in the Universe became ionized.Earth had 1 Continent, mostly desert, no broad leaf trees, no flowers, Earth spun faster, moon was closer.
Overall, 19% of all families and 50% of all genera became extinct.Ions can be created, by either chemical or physical means, via ionization. Theia collided with another planetary-mass object, Gaia (the early Earth) around 4.51 billion years ago.Shape of the Universe - Photo GN-z11 high-redshift galaxy found in the constellation Ursa Major, and is currently the oldest and most distant known galaxy in the observable universe - 13.4 billion years old. That was when the Moon Formed, the Moon was twice as close then it is now causing 10,000 ft. Age of the Earth is approximately 4.54 ± 0.05 billion years (4.54 × 109 years ± 1%).Timeline of Plant Evolution (wiki) - Photosynthesis Horseshoe Crab are marine arthropods invertebrates of the family Limulidae, suborder Xiphosurida, and order Xiphosura.