Which best describes the first law of thermodynamics?
A. Energy can be created or destroyed and it cannot be changed from one form of energy to another.
B. Some useful energy is lost as heat whenever an energy transfer occurs.
C. Energy can be created from matter or used to produce matter.
D. Energy is not created nor destroyed, but it can change from one energy form to another.
E. Energy transfers are always 100% efficient in changing energy from one useful form to another.
Answer: D
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