Surviving Possible Doomsday Scenarios - Extinction Level Events - End Times Prophecy // Documentary. An extinction (level) event (also known as a mass extinction or biotic crisis) is a widespread and rapid decrease in the amount of life on Earth. Such an event is identified by a sharp change in the diversity and abundance of macroscopic life. It occurs when the rate of extinction increases with respect to the rate of speciation. Surviving Possible Doomsday Scenarios - Extinction Level Events - End Times Prophecy // Documentary. Because the majority of diversity and biomass on Earth is microbial, and thus difficult to measure, recorded extinction events affect the easily observed, biologically complex component of the biosphere rather than the total diversity and abundance of life. Possible Doomsday Scenarios - Extinction Level Events - End Times Prophecy // Documentary. Over 98% of documented species are now extinct, but extinction occurs at an uneven rate. Based on the fossil record, the background rate of extinctions on Earth is about two to five taxonomic families of marine invertebrates and vertebrates every million years. Marine fossils are mostly used to measure extinction rates because of their superior fossil record and stratigraphic range compared to land organisms. Possible Doomsday Scenarios - Extinction Level Events - End Times Prophecy // Documentary.

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