What would be the concentration of CuSO4 in solution after 4A of current was passed for 1hr through 500cm3 of a solution that was originally 0.200moldm^-3 using inert electrodes.​

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 .

Answer is (d)a brainliest would be appreciated

English , i don't understand spanish.