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Mass extinction event
Meaning
Noun
●
In Evolutionary theory & Geology:
One of
five
historical
event
s in which the Earth
experienced
a
loss
of ∼75%
of all
species
over a
geological
interval
of
less than
3
million
years, the most
recent
being the Cretaceous–Paleogene
extinction event
66
million
years ago.
Sourced from
Wiktionary
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