Lifeforms have changed throughout Earth's geologic history. Scientists learn about these changes by studying the fossil record. For example, scientists have learned when different groups of organisms

Lifeforms have changed throughout Earth's geologic history. Scientists learn about these changes by studying the fossil record. For example, scientists have learned when different groups of organisms first appeared. These events can be placed within specific periods on the geologic time scale, which is shown below.Dinosaurs first appeared during the Triassic Period, and large mammals first appeared during the Tertiary Period. Flowering plants first appeared after dinosaurs but before large mammals.Using this information and the geologic time scale above, choose the period in which flowering plants first appeared. A. Cretaceous B. Permian C. Quaternary D. CambrianReset Submit