13. In atoms, protons and neutrons are found (a) only in the nucleus.
(b) outside the nucleus.
(c) inside and outside the nucleus.
(d) in the electron cloud.

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 the molar mass of magnesium is 24.305g/mol.

It starts to rust i think