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Aids is a worldwide problem
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OMG so many questions Like I DoN't even Know why I'm reading this
Your answer is B. preposition
The sum of neutrons would be 55. (: I hope this helps. because if you minus the mass number by the atomic number which is always equivalent to the number of protons, you get the amount of neutrons. The amount of protons and neutrons always add up to the mass number.
