Which statement best describes the law of conservation of energy?
o
a. the total energy in an open system can only increase.
b. energy cannot be created or destroyed.
c. energy cannot change forms.
o
o
d. the total energy in a dynamic system can only decrease.

The correct option is B.  Energy cannot be created or destroyed.

Explanation:

The law of conservation of energy states that energy can neither be created nor be destroyed. However, energy can change from one form to another.

Hence, in a system energy might change forms but the total energy on Earth remains the same.

In a food chain, most of the energy is lost as heat. But it still is a form of energy. Hence, energy is neither created nor destroyed, it only changes forms.