Answer:
The answer is option C "They share a common ancestor"
Step-by-step explanation:
Homeostasis can simply be defined as the processes which animals needs to undertaken or the conditions animals exhibits to maintain a balanced or stable condition in the body system that are significant for the survival of the animal.
One of the ways animals maintain a stable state is regulating the body temperature through sweat and this process is peculiar to both Humans and Horses because the share a common ancestor considering Homeostasis to be a mechanism for evolution.