Which branch of the chemical industry usually requires advanced photo attached

R & D is the  branch of chemical industry which  requires advanced degrees.

Explanation:

Research and development department  of a chemical industry will require people holding advanced degrees because :

That will help the chemical company to come up with new advancements and development in preparation of chemical products like :green methods to prepare certain chemicals which usually involves use of toxic substances.for the formulation and development of the new chemical substitutes Improvement of chemical product at microscopic level

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 .