Final answer:
Blood performs several important functions in the body, including transportation, immune defense, and regulation of body temperature.
Step-by-step explanation:
Blood performs several important functions in the body. Its primary function is to transport oxygen, nutrients, and waste products to and from body cells. It also plays a crucial role in immune defense, as it contains white blood cells that help fight off infections. Furthermore, blood helps regulate the body's temperature and maintain homeostasis.