A. Answer True or False. 1. The circulatory system has three parts. 2. The circulatory system helps protect the body from disease 3. Oxygen is a waste made by cells. 4. Blood moves through blood vessels.

Certainly! Here are the answers to the statements: 1. **True.** - The circulatory system is composed of three main parts: the **heart**, **blood**, and **blood vessels** (arteries, veins, and capillaries). 2. **True.** - The circulatory system plays a role in protecting the body from disease by transporting **immune cells**, **antibodies**, and other components of the immune system to sites of infection or injury. 3. **False.** - **Oxygen** is not a waste product; it is essential for cellular respiration, the process by which cells produce energy. The actual waste product from this process is **carbon dioxide**. 4. **True.** - **Blood** circulates throughout the body by moving through an extensive network of **blood vessels**, including arteries, veins, and capillaries, facilitating the delivery of nutrients and removal of waste products.