Mass extinction is a catastrophic event wiping out most species, leading to their complete disappearance. It is followed by accelerated evolution as new species fill ecological niches. Speciation and extinction are continual processes that impact the number of species on Earth.
Mass extinction is an event or environmental condition that wipes out the majority of species within a relatively short geological time period. It is a catastrophic event that leads to the complete disappearance of a species from the Earth, with no members remaining anywhere on the planet.
These mass extinctions have occurred throughout Earth's history, with five major mass extinction events identified. Following these events, accelerated evolution often takes place as new species evolve to fill the ecological niches left empty by the extinct species.
Speciation and extinction are two ongoing evolutionary processes that determine the number of species on Earth, with speciation leading to the evolution of new species and extinction representing the global loss of a species.
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