A. Through fossils, it is possible to understand the traits of now-extinct organisms.
Fossils can be used to form phylogenetic trees by helping scientists to understand the evolutionary relationships between species. By examining the characteristics of fossils, scientists can infer evolutionary relationships and reconstruct the branching pattern of evolutionary history. This information can then be used to construct phylogenetic trees, which are diagrams that show the evolutionary relationships between species. By comparing the similarities and differences in the physical characteristics of different species, scientists can infer which species are more closely related and which are more distantly related. These relationships provide important insights into the evolution of life on Earth and help us to understand the history of life on our planet.