The Gaia hypothesis states that the biosphere is its own living organism. The hypothesis suggests that the Earth is self-regulating and tends to achieve a stable state, known as homeostasis . For example the composition of our atmosphere stays fairly consistent, providing the ideal conditions for life. When carbon dioxide levels increase in the atmosphere, plants grow more quickly. As their growth continues, they remove more carbon dioxide from the atmosphere. In this way, the amount of carbon dioxide stays fairly constant without human intervention.
Mark hated that his boss turned the heat up so high in the office. He was always hot and sweaty when he was at work.  However he missed that heat when he went outside later in the afternoon. It was 10 degrees outside and he shivered the whole way to his car.
What is one thing Mark's body did to self regulate its temerature??