Answer: it is A
Explanation:
Answer:
1. Protons
2. Neutron
3.Electrons
Oxygen
Silicon
Aluminium
Iron
Calcium
Oxygen=47 percent
Silicon=28 percent
Aluminium=8 percent
Iron=5 percent
Calcium=3.5 percent
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A chemical reaction happens when substances break apart or combine to form one or more new substances.
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