Why is rapid defibrillation important to survival

Idon’t know the answer and i’ve been stuck on it for a while now skskskskks

Which best describes the nucleus of an atom a. it is where all of the particle s of the atom are located b. it is the negatively charged part of the atom c. it is where the electrons and the protons are located d. it is the part of the atom with the greatest mass

Explain the process that creates the heat of the sun?