Why don't the chocolate chips melt when making cookies

You'll see that the chocolate chips are definitely melted. In fact, they won't re-solidify completely for some time afterward. Part of the reason the chocolate chips retain their shape when melted is that they are partially insulated from the heat of the oven by the cookie dough.
        Anna

They do melt, just retain their shape.

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 .