This product is aligned to the AZ State Standards for 6th Grade Science (Strand 4, Concept 1, PO 7: Describe how the various systems of living organisms work together to perform a vital function- respiratory and circulatory, muscular and skeletal, digestive and excretory). There are also questions about the lymphatic and immune systems, which can be removed by editing the PDF. The first item is a study guide written to be answered with complete sentences. The second item is a multiple choice test. Answer keys for both are included.