Answer:
A
Explanation:
The number of protons and neutrons of an element is the same. the electrons are the only thing that can differ. The atomic number equal the protons and neutrons.
Answer:
A. have subjects wear the shoes in an experimental trial to see if symptoms improve.
Its A because I did it on connexus
Varuable, In algebra, a symbol (usually a letter) standing in for an unknown numerical value in an equation :)
