Testbank, Question 5.063 Zinc metal reacts with nitric acid solution to produce zinc nitrate (in solution), ammonium nitrate (in solution), and water. The species being reduced in this reaction is
O Zn(s)
O Zn2+ (aq)
O Zn(NO3)2(aq)
O HNO3(aq)
O NH *(aq)​

Ithink the answer is 56.

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 nitrogen-containing bases