Question

The diagram shows a human body system. Which of the following gives the main function of the system shown?

A. preventing and fighting diseases
B. carrying oxygen to cells and waste from cells
C. controlling the functions of the other body
D. breaking food into a usable form of energy for cells
(btw i don’t know if this is biology or chemistry)

Answer 1

Explanation: D breaking food into a usable form of energy for cells