A. fish and bird C. birds and mammals B. fish and reptiles D. amphibians and mammals Looking Back Directions: The following items are about human body systems discussed in the previous module. Recall the body system being described in each item then write the letter of the correct answer on the answer sheet provided. 1. It is the organ system that is composed of bones and muscles that provide form, support, stability and movement to the body. A. circulatory B. respiratory C. muscular D. digestive 2. It is a body system composed of the skin and its derivatives that help protect the body. 2.
