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

Explanation

The presence of feathers in dinosaurs and birds ndicates that they are evolutionarily related. Dinosaurs had feathers not for flying but instead these feathers provided insulation to these warmblooded animals. However, the feathers in birds are used for flight. This proves that reptiles and birds are closely related and that the evolution of wings started in reptiles.