Which best describes the purpose of a fever? to make the body too hot for the bacteria to live to make the body too cold for the bacteria to live to stimulate lymphocytes to make antibodies to stimulate an increased production of sweat

Answer True or False. 1. Cartilage is harder than bone. 2. You have the same amount of cartilage in your body all your life. 3. Bones can repair themselves. 4. Red blood cells are made in marrow. 5. Bones always stay the same size. 6. Some cartilage changes to bone.

D. Answer the questions. 1. What tissues hold bones together? 2. How do hinge joints work? 3. What kind of joint can move in a complete circle?

B. Write the letter for the correct answer. \( \begin{array}{lll}\text { 1. A vertebra is part of the } \\ \begin{array}{lll}\text { (a) skull } & \text { (b) backbone } & \text { (c) rib cage }\end{array} \\ \begin{array}{lll}\text { 2. The ribs are attached to the }\end{array} \\ \begin{array}{lll}\text { (a) skull } & \text { (b) brain } & \text { (c) backbone }\end{array} \\ \begin{array}{lll}\text { 3. A group of bones that protects the brain is the } \\ \text { (a) skull } & \text { (b) backbone } & \text { (c) rib cage }\end{array} \\ \begin{array}{lll}\text { 4. The backbone is made up of many cords } & \text { (b) ribs } & \text { (c) vertebrae }\end{array}\end{array} \).

The part of the skeleton that protects the spinal cord is the \( \begin{array}{lll}\text { (a) rib cage } & \text { (b) skull } & \text { (c) backbone } \\ \text { The } & \text { is the part of the skeleton that protects the heart. } \\ \begin{array}{lll}\text { (a) skull } & \text { (b) rib cage } & \text { (c) backbone }\end{array}\end{array} \)

Use each word to write a sentence about how your body moves. 1. hinge joint 2. ball-and-socket joint