Final answer:
Different dominant predators between the northern and southern continents arose due to the separate evolutionary paths following the breakup of the supercontinent Pangaea, as well as subsequent human activities leading to extinctions.
Step-by-step explanation:
Why Different Dominant Predators Existed Between Northern And Southern Continents
The presence of different dominant predators between the northern and southern continents can be explained by the concepts of biogeography and evolution in relation to tectonic plate movement. The distribution of organisms follows patterns established by their evolution over geological time. Predators that evolved before the breakup of the supercontinent Pangaea spread worldwide, while those that evolved after the breakup were unique to the continents formed from Pangaea's fragments, Laurasia in the north and Gondwana in the south. Hence, different forms of life, including dominant predators, emerged on these separate land masses as they evolved in relative isolation from one another. Additionally, human activity has had a significant impact on the environment and fauna, leading to extinctions that also affected the balance of predatory species across different regions.