D.
Most are poor conductors of electricity.
Protons and neutrons. Explanation:
Protons are massive, positively charged
nuclear particles.
In physics, the law of conservation of energy<span> states that the total</span>energy<span> of an isolated system remains constant—it is said to be conserved over time. </span>Energy<span> can neither be created nor destroyed; rather, it transforms from one form to another.</span>
