Why do south pole and north pole and south pole attract?

The opposite of two magnets attract. Therefore, when the red end of a compass is pointing south, it is because it's being attracted in that direction by the north end of another compass

What does that mean you dum bum

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 .