A. Filtration
This is because of the layers of Filter it goes through to make sure it is pure.
Is an imbalance of electric charges within or on the surface of a material. The charge remains until it is able to move away by means of an electric current or electrical discharge. Static electricity is named in contrast with current electricity, which flows through wires or other conductors and transmits energy.[1]
Answer:
4- radioactive isotopes
Explanation:
I don't remember exactly but this question was on the regents
