Answer: i would say D or the last one.
Explanation: According to the law of conservation of mass, the mass of the products in a chemical reaction must equal the mass of the reactants. The law of conservation of mass is useful for a number of calculations and can be used to solve for unknown masses, such the amount of gas consumed or produced during a reaction.
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There are 94 naturally occurring elements
Makes it seem bigger and brighter
2. <span>1/8 = (1/2)³ </span>
<span>so it's 3 half lives.</span>