Species X is an extinct animal. A scientist has discovered fossils of species X and compared them to species Y, a living animal that inhabits the same area where the fossils were found. The scientist has noted that the two animals share several physical characteristics.
What can the scientist most likely conclude about the two types of animals?
Species X was better adapted to the environment.
Species X outcompeted species Y for food.
Species X is an early ancestor of species Y.
Species X mated with species Y and had unique offspring.