The human body contains several organ systems, each with a specific function. The diagram below shows one organ system of the human body. What is the function of this organ system? (SC.6.L.14.5)
A. to provide structure and support for the human body
B. to transmit messages between different parts of the body
C. to defend the body against organisms that cause diseases
D. to break down food into substances that the body's cells can use