Dr. wilson is analyzing the similarities between the wing of a bat and the arm of a monkey. he is using comparative embryology comparative morphology the fossil record vestigial features

The right option is; comparative morphology

He is using comparative morphology.  

Comparative morphology is the study of outward features (in terms of structure, size, pattern, and shape) of animals of different species. Comparative morphology can be used to analyze the anatomical similarities and differences that exist between organisms and it helps to distinguish one species from one another.

a. by using fur or clothes to trap heat energy near the body