Answer: B) Desert pack rats are active at night to conserve water.
Step-by-step explanation:
Homeostasis is the ability or quality of the body to maintain the internal temperature constant and stable with respect to the changes occurring in the external environment. This involves maintenance of the internal temperature, pH, and conservation of water.
B is the correct option this is because of the fact that in desert water conservation will be the beneficial adaptation. The rat may experience dehydration in day but water will not be lost in night. This will help in maintaining the homeostasis.