Isobutylbenzene was treated with chlorine gas while having UV light directed on it. How many possible distinct monochlorinated products, including stereoisomers, could form in this process

I'm not sure but i will try to find out

C: plants and animals

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 .