I honestly think that it would be D. Not 100% sure but it just makes sense
Answer:
Sweating and Dilation of skin blood vessels.
Explanation:
Homeostasis may be defined as the phenomena by which living organisms maintain their internal body environment. Exothermic animals spends energy for the maintenance of homeostasis.
The humans maintain their internal body temperature irrespective of their external environment. In case of excess temperature in summer, humans maintain their internal temperature by perspiration known as sweating and dilation of the blood vessels.
Thus, the correct answer is option (D).
The obvious answer is a bc it does not use and toxic fuels
