From Sun to Sandwich: Modeling Energy Flow in Living Systems NGSS-Aligned | LS2 | Cause and Effect | Digital ModelingWhat happens inside a living system between sunlight and the lunch we eat? In this interactive simulation, students build and test a system model that tracks how energy flows through plants, animals, and cells—revealing invisible biological processes beneath everyday life. Instead of memorizing parts of a food web, students investigate cause and effect within a living system. The