The human body is made of cells. cells make tissues, tissues make organs, and organs work together to make ____
A. major organ systems of the human body include the nervous, immune, excretory, reproductive, and respiratory systems.
B. the system transports oxygen throughout the body through the blood.
C. the digestive system breaks down and absorbs nutrients from food.
D. the system protects vital organs, gives the body structure and support, and allows for movement.