Cnidaria and flatworms exchange gases and remove wastes by way of their
A)open circulatory systems.
B)closed circulatory systems.
C)gastrovascular cavities.
D)moist skin surfaces.
E)respiratory and excretory systems.

Question

Quizplus · Accepted Answer

Cnidaria and flatworms use their gastrovascular cavities for gas exchange and waste removal, as these structures allow direct contact with the environment, facilitating diffusion.

Cnidaria and Flatworms Exchange Gases and Remove Wastes by Way