I am currently a double major in biology and math, interested in mathematical modeling of ecosystems and physiological systems. The math portion involves modeling and pure math, but there isn't a lot of concentration on knowing physical laws. I'm not sure if I would miss all the knowledge about waves, electricity, statistical mechanics, fluid mechanics, etc., and I don't know if that'd be a disadvantage for when I apply to grad school for applied math. Also, given that I'm a junior, I will only be finishing the bare minimum that allows me to get a physics degree, while I'm already into the math major. Still, I'm doing well in my pure math classes and enjoy them, but I don't know if being unable to take stat mech/fluid mech/etc. will be a disadvantage when it comes to mathematical modeling of say, cardiovascular systems, for research (that would show up for my grad school transcript). I'm already self studying programming, so I have limited free time. What is the best option when it comes to mathematical modeling? A math degree (most of it is proofs, which I see in texts like smale's dynamical systems) or a physics degree?