Most animals use a circulatory system in which blood or a similar fluid is circulated among body tissues. Which animals do NOT depend on a circulatory system?
A. Small terrestrial invertebrates, which do not rely on oxygen or produce carbon dioxide wastes
B. Very large aquatic animals, which move water through their tissues instead of blood
C. Aquatic animals made of thin layers of cells, which rely on diffusion to transport materials
D. Earthworms and other small invertebrates, which rely on diffusion to transport materials