Question

there is a law in science that says that energy can change forms. what do we call this law? the law of thermodynamics the law of matter

Explanation:

The law related to energy changing forms is part of thermodynamics (specifically, the first law of thermodynamics deals with energy conservation and transformation). The "law of matter" is not a standard term for energy transformation; matter - related laws (like conservation of mass - though now mass - energy equivalence is known) are different from energy - form - change laws. So the correct option is the one about thermodynamics.

Answer:

the law of thermodynamics