Final answer:
Placodonts were land-dwelling herbivorous reptiles that lived during the Triassic period. They had a specialized dentition for crushing hard mollusk shells and a heavily armored body.
Step-by-step explanation:
Placodonts were land-dwelling herbivorous reptiles that lived during the Triassic period. They had a unique specialized dentition with broad, flat teeth that were adapted for crushing hard shells of mollusks. These reptiles had a heavily armored body with large plates covering their back and belly, providing protection from predators.
Learn more about Placodonts