Paleontologists (scientists who study dinosaurs) have found large smooth rocks near the rib bones of Apatosaurus fossils.
(scientists; study; dinosaurs) (Paleontologists; have found; large smooth rocks; L:near the rib bones of Apatosaurus fossils)
scientists Paleontologists
study have found
dinosaurs
large smooth rocks L:near the rib bones of Apatosaurus fossils