The number of protons is equal to: a. the energy levels
b. the atomic number
c. the number of neutrons
d. the periodic table groups

The independent variable is the type of music.the dependent variable is the pulse rate.the intervening variable is the age of the subject.if the mother does not like rock, her pulse is likely to not increase.the same might be true for the sister.the friend may like rap and gets excited.to establish cause/effect relationship, all of the subjects must be consistent.hope i .

Answer/// he concludes that the atom particles can be broken due to the paddle wheel being moved by particles coming out of the metal;