Answer:
i think iam not sure it is C
The action or fact of forming a united state that seems as the best answer
<span>It is important to determine weather the heat is coming from the bottom of the phone or from a different area because if you feel the heat is being emitted from the bottom of the phone, this is indicative of a battery overheating. If heat comes from other areas, it often means the phone itself is overheating.</span>
I think the answer is Specialized cells!