1. The modern periodic table is ordered by which of the following factors? A. The number of electrons
B. The number of protons
C. The atomic mass
D. The elements

I think the answer is B because it’s the same thing as the atomic number

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 .

No because it not possibly