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Records of the appearance and disappearance of particular taxa at a single locality are insufficient to define a bioevent.Late Devonian Extinction was one of five major extinction events in the history of the Earth's biota.- Galaxies - Space - Black Holes - Earth - Planets - Moon - Stars - Sun - Solar System Magnetics - Gravity Extra Terrestrial - ET - Space Aliens - Probes Space Station - Space Shuttle - Space Travel Satellites - Asteroids - Telescopes Time Measuring Pyramid of Complexity Science - Physics The photo on the right is not a Selfie.It is just an Artist rendition of what our galaxy would look like from another galaxy.Gondwana is the name given to an ancient supercontinent.It is believed to have sutured between about 570 and 510 million years ago (Mya), joining East Gondwana to West Gondwana.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.

Reionization marks the point at which the hydrogen in the Universe became ionized.

Ions can be created, by either chemical or physical means, via ionization. Oxygen is what makes the sky blue, molecules in the air scatter blue light from the sun more than they scatter red light.

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. Mostly Molten Rock Theia collided with another planetary-mass object, Gaia (the early Earth) around 4.51 billion years ago. New type of Green Algae produced O2, which created the Ozone Layer that protected life from damaging UV Rays and gave life a chance to progress.

Both the start and end of the period are marked by major extinction events.

Earth had 1 Continent, mostly desert, no broad leaf trees, no flowers, Earth spun faster, moon was closer.