Final answer:
The conservation of mass and energy is supported by various experiments and observations. Mass is conserved in chemical reactions, while energy is conserved and can be converted into mass or vice versa. This principle is fundamental in physics and has been validated through empirical evidence.
Step-by-step explanation:
Conservation of mass and energy is supported by various pieces of evidence. The law of conservation of mass states that the total mass of the reactants before a chemical reaction is equal to the total mass of the products after the reaction. This can be observed through experiments where the mass of the reactants is measured before and after the reaction, and the masses are found to be the same.
Similarly, the law of conservation of energy states that energy cannot be created or destroyed, only transferred or converted from one form to another. This principle is supported by numerous experiments and observations in different fields of science. For example, in nuclear reactions, mass can be converted into energy according to Einstein's equation E = mc², where E represents energy, m represents mass, and c is the speed of light.
Overall, the evidence supporting the conservation of mass and energy comes from careful measurements and observations in various experiments and natural phenomena.