E = mc^2<span> is an equation derived by the twentieth-century physicist Albert Einstein, in which E represents units of energy, m represents units of mass, and c 2 is the speed of light squared, or multiplied by itself.</span>
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hmmmm not sure and don't know
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last one is the correct and most suitable option.
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Mendeleev left spaces in his periodic table because he predicted there were elements that weren't discovered yet that would fit in these spaces.
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