In a system, a set of things—organs, animals, class members, etc— are interconnected in ways that cause the system to behave as it does. So to analyze system behaviors, it is helpful to identify the key parts of the system, then to examine the interconnections—how the behavior of each part affects the behavior of other parts—and finally, to look at how the interactions of all the parts produce the overall behavior of the system.
These two media resources provide examples of systems. Watch either of the videos and then identify the system you see, its parts, and their interactions.
Video: An Urchin Matter
Video: Clem Marvels at a Mangrove