Final answer:
The large tusks of Heterodontosaurus were most likely used for digging rather than for defense, attack, or processing meat.
Step-by-step explanation:
The large tusks of Heterodontosaurus were most likely used for digging. Heterodontosaurus, a small ornithischian dinosaur from the Early Jurassic period, is not typically associated with hunting or carnivorous behavior. Instead, these dinosaurs are thought to have been herbivorous or omnivorous. Their tusks could have been used to dig for roots or water sources, to strip bark from trees, or potentially to forage for insects and other small prey. The use of tusks for defensive purposes cannot be ruled out completely, as tusks might have been used against predators or in intraspecific competition, but their primary function appears to be more for foraging than for attack or defense.
The large tusks of Heterodontosaurus were used for defense and display. These tusks were likely used by males during combat for dominance and also for displaying aggression to deter predators or attract mates.