Coral doesn’t have a circulatory system. Coral’s stomachs mainly serve as the circulatory system because gastrovascular system. Many species of fish live with the coral aid in the circulation of materials, oxygen, and nutrients for the coral. There is a unique cell in coral which helps to gather food. The food is collected and taking into the central gastrovascular cavity where extracellular digestion takes place and then intracellular digestion happens. The branches of the gastrovascular cavity allow the materials, nutrients, and food to travel all over the body of the coral.