C; rolls in mud to cool off and deter flies All the other answers refer to structural (physical) adaptations.
An example of homeostasis would be sweating when the temperature is hot.
The respiratory system regulates oxygen flow, and provides regulation for oxygen blood content. Circulatory system plays a roll in providing enough oxygenated blood to the body
Being in nature or even viewing scenes of nature reduces anger fear and stress and increases pleasant feelings. exposure to nature not only makes you feel better emotionally it contributes to your physical well-being reducing blood pressure and heart rate muscle tension in production or stress hormones
