This is becoming more obvious nowadays since many people are taking physics to be part of maths and some professionals are bridging from various courses to that and even being more preffered e.g the engineers and others. So if by any chance you come through bio/math or chem/math, I'd advice you to take that one for now because more people are shying away from bio and Chem yet they are remaining the most marketable courses plus many people get jobs and drop most of the biology and chemistry subjects making the teachers teaching these subjects in various schools being very limited.