Mass extinction happens when many individuals of a species are lost within a short period while regular extinction happens over a longer period of time.
Mass extinction refers to the loss of many species within a short period of time.
Mass extinction can be caused by catastrophic events that result in the destruction of habitats, climate change, extreme temperature change, volcanic eruptions, and so on.
If the loss of species happens over a long period of time, it is no longer considered mass extinction but regular extinction.
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