Final answer:
Mapusaurus might sometimes have fed on Argentinosaurus as both species co-existed, and it's plausible that pack-hunting behavior in Mapusaurus could have allowed it to prey on large dinosaurs.
Step-by-step explanation:
It is true that Mapusaurus, a large theropod dinosaur, might sometimes have fed on Argentinosaurus, which was one of the largest land animals to have ever existed. Paleontologists have suggested this possibility based on fossil evidence that indicates these two species lived in the same region and at the same time. Mapusaurus was a carnivorous dinosaur, forming hunting packs that could have taken down large prey like Argentinosaurus, although definite proof of this interaction is lacking and would be difficult to establish.