The organism at point W is a bony fish. The organism at point X is a dinosaur. The organism at point Y is a trilobite. The organism at point Z is an amphibian. This diagram suggests that A.) trilobites are the youngest living creatures on the planet.
B.) in this region dinosaurs lived after the bony fish.
C.) amphibians are common ancestors of dinosaurs and trilobites.
D.) dinosaurs became extinct before the evolution of bony fishes.