A student was asked to demonstrate a chemical change to the class. A candle was lit and it burned the student explain that the shorter length was evidence of chemical change. This explanation is not complete. The student should also include which of the following in his explanation? A. Color change
B. Solid formation
C. Heat giving off
D. Keep taking in

Okay this will take 1 hour okay dont forget me.

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 .

Not a  mixture of two common elements that can be separated by physical means.