Answer:
a. Entropy
Explanation:
Entropy is the measure of the degree of disorder of a system, being a measure of the unavailability of energy. Rudolf Clausius was the first to use the term Entropy in 1865. Entropy would be the measure of the amount of thermal energy that cannot be reversed into mechanical energy (cannot perform work) at a given temperature.
Because of this concept, we can understand that the tendency of energy to be lost as heat during the transformation of organic matter supports the concept of entropy.
