The graph shows the changes in the number of animal faunas living on Earth over time and how the faunas were affected by different extinction
events.
Five Extinction Events on Earth
Key
Modern fauna
Paleozoic fauna
Cambrian fauna
§ 300
Modern fauna
Paleozoic fauna
Prec.
600
Cambrian fauna
Cambrian
Ordov.
Sil.
Dev.
400
Carbonif. Per. Tri. Jurassic Cretaceous Tertiary
200
Millions of Years Before Present
2.6 Which statement is correct about the changes in faunas during one of
these five major events?
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 inthe number of Paleozoic faunas.
c
The event at the end of the Cretaceous resulted in the extinction of more faunas than in any other period.
d
The event at the end of the Triassic (Tri.) resulted in the extinction of fewer faunas than in any other period.
c
The event at the end of the Cretaceous resulted in the extinction of more faunas than in any other period.