This document discusses movement and the human skeleton. It covers movement in different animals like earthworms and fish. For human beings, it examines the functions of the skeleton, parts of the skeleton like bones and joints, and types of movable joints. It also discusses muscles, cartilages, ligaments, tendons, and how x-rays are used to view the skeleton. The human skeleton is made up of 206 bones that are connected by joints, which allow movement and are divided into three types depending on freedom of movement.