MOST high schools teach biology, then chemistry, then physics. What do you see as some of the disadvantages of the traditional sequence to both students and teachers.

We'll all sciences are based on physical science (i. e. chemistry and physics), it might be easier for students to understand biology if they learn physical science since all life science depends on the scientific laws that govern our works. For example, it might be easier for students to understand why living things need water and nutrients if they first understand the chemical makeup of these substances.