Which of the following organisms would have used pebble- to cobble-sized gastroliths?

Name: Which of the following organisms would have used pebble- to cobble-sized gastroliths?
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Pebble- to cobble-sized gastroliths are often associated with herbivorous dinosaurs. These gastroliths were likely used in the dinosaur's digestive system to help break down tough plant material. Cambrian trilobites, Eocene mammals, and Devonian sharks are not known to have used gastroliths.

Which of the Following Organisms Would Have Used Pebble- to Cobble-Sized