The correct answer is that a biozone can help in tracing the path of evolution over time.
Biozone refers to a stratigraphic unit that comprises fossils in the layers of strata prevailed in a specific geologic period. It is termed as biozone as it signifies the number of biological taxa prevailed in specific strata. Thus, the changes in characteristics within the taxonomic groups in biozones can provide the indication of evolution with regard to time.