Extinctions of species is fairly uncommon in the Earth's history because extinctions tend to be caused by humans.

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Extinctions of species have occurred throughout Earth's history, long before the evolution of humans. Many extinctions have been caused by natural events such as volcanic activity, climate change, and asteroid impacts. While human activity has certainly contributed to extinctions in more recent times, it is not the sole cause throughout Earth's history.

Extinctions of Species Is Fairly Uncommon in the Earth's History