This resource is great for a an introductory or extension assignment, as well as a sub plan assignment, no outside sources are needed. The worksheet utilizes informative text and illustrations to provide a foundation of knowledge over the following standard: SC.6.L.14.5 - Identify and investigate the general functions of the major systems of the human body (digestive, respiratory, circulatory, reproductive, excretory, immune, nervous, and musculoskeletal) and describe ways these systems interact