Final answer:
Dental batteries, consisting of packed teeth, were crucial in the success of herbivorous ornithopods, making the statement True.
Step-by-step explanation:
The success of ornithopods, which are a group of herbivorous dinosaurs, was indeed linked to structures called dental batteries. These dental batteries consisted of many teeth packed together, which allowed ornithopods to efficiently process plants. This feature contributed significantly to their success as herbivores. Therefore, the statement that dental batteries were key to the success of ornithopods is True.