The procedure refers to a eudiometer, but it also mentions that the stopcock must be closed. There is a picture of a eudiometer in the book. What can be used for this lab instead of a eudiometer (gas collection tube)?

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 sucrose.