A student is eating an apple. Part A. Which of the following describes how the student's body systems work together to release energy from the apple? A. The digestive system breaks down the apple into usable molecules, and the circulatory system delivers the usable molecules to the cells.
B. The respiratory system breaks down the apple into usable molecules, and the digestive system delivers the usable molecules to the cells.
C. The circulatory system breaks down the apple into usable molecules, and the excretory system delivers the usable molecules to the cells.
D. The excretory system breaks down the apple into usable molecules, and the respiratory system delivers the usable molecules to the cells.