Answer:
The answer is making essential comparisons with humans.
Step-by-step explanation:
Comparative psychology consists of the scientific study of the different mental processes as well as behavior related to non-human animals. Research made in this area tries to solve many issues, uses some methods, as well as it examines the behavior concerning different types of species.
Comparative psychology usually makes some comparisons between species. It includes comparisons between humans and animals. Some researches consider that comparative psychology should focus its studies in a single organism to understand all the aspects referring to it.