After analyzing a group of dinosaur bone fossils born in Sichuan, the researchers found that the arsenic, barium, chromium, uranium, and rare earth elements in the bone fossils are extremely high. Compared with modern terrestrial animals, the toxic elements in their bodies are much higher. Hundreds or even thousands of times higher, so some paleontologists speculate that these dinosaurs died of chronic poisoning. If the following are true, the above speculations cannot be questioned:. ['Toxic elements in the soil near dinosaur fossils will infiltrate evolutionary rocks.', 'There are many corresponding detoxification elements in dinosaur fossils.', 'These dinosaur fossils are all old dinosaurs, which belong to natural death.', 'There are few toxic elements in the plant fossils near the dinosaur fossils.']