What mass of sodium bromide would be needed to form a saturated solution in 25 g of water at 300K? The solubility of sodium bromide at a given temperature is 20. Write the difference between sol and gel.​

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 .

The answer is b because a,c,and d are opinons