Give an example of characteristics being used to determine how close two species are in evolutionary terms.

(N/A) The presence of feathers in both dinosaurs and birds indicates that they are evolutionarily related. Dinosaurs possessed feathers not for flight,but to provide insulation to these warm-blooded animals. Later,these feathers were adapted for flight in birds. This evolutionary link proves that reptiles and birds are closely related and that the evolution of wings originated in reptiles.