<human>:  Why does the process of ‘thermogenesis’ happen?
<bot>: Thermogenesis is the process by which a living organism generates heat. It is a form of endothermy. Endothermy is the ability of an organism to generate its own heat, which is necessary for its survival. Endothermy is a key feature of mammals, birds, and reptiles. It is also a key feature of humans.