Q7: Three identical flasks contain three different gases at standard temperature and pressure. Flask A contains CH4, flask B contains O3, and flask C contains N2. Which flask contains the largest number of molecules?

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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 .