Heat transfer by convection is based on a) particles bumping into each other due to increased motion
b) electromagnetic radiation moving through space
c) the current set up when the density of a substance changes as it warms or
cools
d) the ability of different substances to transfer heat differently
e) none of the above

Ok where is the image ?

Ithink it’s one of those things that you put the object on

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 .