When moving down a column in the periodic table, which of the following increases A. atomic mass
B. atomic number
C. group number
D. atomic mass and 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 .

B.) falsehope this !

The answer is nitrogen-containing bases