Final answer:
Plate tectonics influenced the evolution of dominant animal life in the Mesozoic Era by creating new environments and ecological niches for species to diversify and evolve.
Step-by-step explanation:
Plate tectonics greatly influenced the evolution of dominant animal life during the Mesozoic Era. The movement of continental plates led to the formation of supercontinents like Pangaea, which affected the distribution of terrestrial and marine habitats. As the continents shifted and new environments were created, different niches and ecological opportunities emerged, allowing for the diversification and evolution of new species. For example, the formation of new mountain ranges and inland seas led to the isolation of certain animal groups, facilitating speciation and increased biodiversity. Additionally, changes in climate and sea level associated with plate tectonics influenced the availability of resources and the composition of ecosystems, further shaping the evolution of dominant animal life during this era.