How do scientists know that dinosaurs dominated in the Mesozoic Era and mammoths appeared in the Cenozoic Era?
A.Dinosaur fossils are found in rocks that are older than the rocks that contain mammoth fossils.
B.Dinosaur fossils are bigger than mammoth fossils.
C.Dinosaur fossils are found in rocks that are newer than the rocks that contain mammoth fossils.
D.Dinosaur fossils are found in the same rocks that contain mammoth fossil