The diagram below represents a series of rock layers from a single location. Each different type of shape shown in the layers represents a fossil of a different species. Suppose each symbol is related to a particular species in the following ways: A green square represents a species of carnivorous dinosaur. A yellow triangle represents a species of fern tree. A blue star represents a species of conifer tree. A purple circle represents a species of early amphibian. A red starburst represents a species of beetle. Judging from the diagram, which statement is true? A. The carnivorous dinosaur species lived at the same time as the conifer tree species. B. The fern tree species lived at the same time as the beetle species. C. The carnivorous dinosaur species lived after the early amphibian species. D. The fern tree species lived before the early amphibian species.