How does the matter and energy in a system naturally change over time?

a. it increases in energy.
b. it becomes more spread out.
c. it becomes more efficient.
d. it decreases in entropy.

Answer;

D.It decreases entropy.

Explanation;Various systems which exists in nature posses energy and matter that move through these system continuously. The movement of energy and matter in a system differs from one system to another. In a closed system for example, only energy flows in and out of the system while matter does not enter or leave the system. On the other hand, in open system both the matter and energy move into and out of the system. Therefore, matter and energy in a system naturally change over time will decrease in entropy.