Why is it called relative atomic mass?

Because the actual mass of a proton is 1.67x10^-27 and the same for a neutron so the mass is relative to the size of protons/neutrons. That's why electrons are not taken in to account when calculating the mass as their mass is 9.11x10^-31 so would make very little difference to the total mass.

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 .

Naoh + hbr -> nabr (salt) + h2o ca (oh)2 + 2hbr - - - > ca (br)2 + 2h2o