Final answer:
Iron is important for oxygen transport, DNA synthesis, and energy production, all of which are vital for the body's proper functioning.
Step-by-step explanation:
The three important body processes that iron is required for are oxygen transport, DNA synthesis, and energy production. Iron is a crucial component of hemoglobin, which carries oxygen in the blood to all parts of the body. It is also vital for the function of enzymes involved in energy production and is an essential element for the synthesis of DNA. Iron's role in these processes underlines the importance of maintaining adequate iron levels within the body for overall health and proper physiological functions.