Reddit reviews Modeling Life: The Mathematics of Biological Systems

There's a good introductory textbook on nonlinear dynamical systems and applications to biological systems called Modeling Life that I help teach a class for. It's aimed to be easily digestible for college freshmen so it has some introductory calculus in there but there's also some really nice connections between dynamical systems and real life systems that's outside of what's normally taught in college differential equations courses.