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a
The event at the end of the Devonian (Dev.) resulted in an increase in the number of Cambrian faunas.
b
The event at the end of the Cretaceous resulted in an increase in the number of Paleozoic faunas.
c
The event at the end of the Triassic (Tri.) resulted in the extinction of fewer faunas than in any other period.
d
The event at the end of the Cretaceous resulted in the extinction of more faunas than in any other period.