Scientists find dinosaur fossils in the bottom rock layers of a cliff and mammal fossils in the middle rock layer of the cliff. Which could best be concluded from this evidence?

Pick the answer from these options

OPTIONS:
- Dinosaurs ate plants.
- Dinosaurs were eaten by the mammals.
- Dinosaurs lived on Earth before the mammals.
- Dinosaurs and mammals lived at the same time.
Dinosaurs lived on Earth before the mammals.