The Permian Period Ended and Then Rapid Speciation Occurred as New

Multiple Choice

The Permian period ended and then rapid speciation occurred as new animal and plant forms evolved. The most likely explanation for this is ________.
I.adaptive radiation
II.ecological opportunity
III.lack of competition
IV.morphological innovation

A) just one of the above
B) two of the above
C) three of the above
D) all of the above