Which two organ systems work together to remove wastes from the body?
A. The integumentary system, which acts as a barrier to prevent
pathogens from entering the body
☐ B. The respiratory system, which exhales carbon dioxide that enters
the lungs from blood vessels
C. The digestive system, which breaks down food into nutrients that
are absorbed by the blood
D. The excretory system, which removes salts and other chemicals
from the blood