The elements most likely to form more than type of ion are a. transition metals b. alkali metals c. halogens d. alkaline earth metals

The elements most likely to form more than one type of ion are thetransition metals

 D   transition metals.

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 .

Ais your answer to this