Answer:
The correct answer is mass extinctions, Wegenerian cycles, and the emergence of new forms of life.
Step-by-step explanation:
Every geological period is featured by the occurrences of Wegenerian cycles, mass extinction, and the origination of novel forms of life. The boundaries of the majority of geologic periods are generally mass extinction periods and this mass extinction stimulates the formation of new forms of life.
At the time of the geologic period, an array of tectonic activities plays an essential part as a consequence of the internal functioning of the Earth. The splitting of the continents takes place and arising of new landform at the plate boundaries takes place. This is termed as Wegenerian cycle.