Final answer:
All living things radiate heat as a result of their metabolic processes, which is explained by the Stefan-Boltzmann law. The emission of radiation is due to their temperature and surface area, principles governed by thermodynamics and electromagnetic theory.
Step-by-step explanation:
The fact that all living things are constantly radiating heat is a result of basic physics principles related to temperature and electromagnetic radiation. According to the Stefan-Boltzmann law, the rate of heat transfer by emitted radiation is P = oAeT^4, where P is the power radiated, o is the Stefan-Boltzmann constant, A is the surface area, and T is the absolute temperature in kelvins. This scientific concept explains that just like the sun and other objects, living organisms emit heat because they have a certain temperature and surface area.
All objects, including living things, that have a temperature above absolute zero emit thermal radiation. Since living organisms have metabolic processes that generate heat, they radiate this heat into their surroundings. This is an inherent characteristic of all matter, governed by the laws of thermodynamics and electromagnetic theory.