The correct statements are:
3. Ostracoderms were the first to die;
4. Plateosaurus died after the ostracoderms;
According to the images it is easy to see that from the three organisms that have been fossilized, the oldest fossils are from the ostracoderms lying just bellow the layers of sedimentary rocks. Just above the sedimentary rocks, are the fossils of the second oldest fossil in these images, the plateosaurus. Above the fossils of the plateosaurs there's a layer of igneous rocks, and above them, in the top and youngest layer we have the fossil remains of the cave bear which is the youngest species of the ones presented.
