Look at the picture above carefully. It represents the transportation inside of a sea sponge.
“This organism has a circulatory system”. Is this statement true or false?
False
Sponges are very simple animals. They rely on the flow of water through their bodies for their transport needs. Oxygen and carbon dioxide directly diffuse in and out of water. They do not have a specialized circulatory system for transporting nutrients and oxygen. Waste products are also directly excreted into the water around them.