(10 points)

i need with numbers 26, 27, and 28
to whoever (or whomever, i don't know) answers it!

The atomic density cuases them to be different u can measure the weight mass density # 28 was cut off picture by the way

And a) oxygen i believe

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 .