In mid-summer, a family assembled a patio set for their deck. Most of the assembling was done by placing metal screws into plastic holes. The furniture was stable throughout the summer. However, when the weather turned cold in the late fall, the family noticed that the chairs and table became wobbly. Which statement best explains what happened?

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 .

1b. convection2f. the same