Q. 1. Give an example of characteristics being used to determine how close two species are in evolutionary terms.
The similar kind of organs is one such evidence that is used to determine how close two species are related. The presence of feathers in dinosaurs and birds indicates that they are evolutionarily related. Dinosaurs had feathers, not for flying but instead, these feathers provided insulation to these warm-blooded 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,
Also if we consider the example of Human and Ape, the body style of both is similar and hence they are closely related in evolutionary terms.