Two students made one fruit cell each. They used the same metals, but one student got a higher voltage than the other.
Why might this happen?

some think that theories become laws, but theories and laws have separate and distinct roles in the scientific method. a law is a description of an observed phenomenon in the natural world that hold true every time it is tested. it doesn't explain why something is true; it just states that it is true.

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an ion is a charged atom or molecule. it is charged because the number of electrons do not equal the number of protons in the atom or molecule. an atom can acquire a positive charge or a negative charge depending on whether the number of electrons in an atom is greater or less then the number of protons in the atom.

less than one you can't create energy

the entire statement is true and correct.  

there's no diagram, nothing is illustrated, and no question is asked.