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adelina 88 [10]
3 years ago
9

Please Help.........................

Biology
2 answers:
Dmitrij [34]3 years ago
8 0
B. Add the (mass) of protons and neutrons together.
Yanka [14]3 years ago
8 0
Its B i believe because protons and neutrons are found in the nucleus which makes up the mass of an atom
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