In order for cells in multicellular organisms to exchange gases, a circulatory system must be present.

Question

Quizplus · Accepted Answer

Gas exchange in multicellular organisms can occur through diffusion directly from the environment into cells (as in simple organisms like sponges) or through specialized respiratory systems (like lungs or gills), which are not the same as the circulatory system. The circulatory system aids in the transport of gases to and from cells but is not required for the direct exchange of gases.

In Order for Cells in Multicellular Organisms to Exchange Gases