Digestion in porifera, or sponges, occurs in individual cells, which envelop and break down food particles. Sponges lack tissues, organs and organ systems, so they don't have the same digestive systems as more complex an... More »

Cnidarians have a digestive system with only one opening through which both digested and undigested material passes. This type of system is called a gastrovascular cavity. Cnidarians use their stinging organelles to stun... More »

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The cardiovascular system interacts with the digestive system by carrying digested nutrients throughout the body via the bloodstream, explains Southwest Tennessee Community College. The digestive system also works with t... More »

Sponges filter food particles out of the water by forcing the water through their porous bodies with a self-generated miniature current, which brings particles within reach of the walls of their pores where cells absorb ... More »

Depending on the sponge, food is obtained through filtering water for nutrient-rich particles or snaring small sea creatures with specially adapted arms. Most sponges are detritivorous, consuming debris particles and mic... More »

Oysters eat plankton, algae and small food particles that wash over their gills. Both oysters and clams use the same type of siphoning and straining system to remove food from the water around them. More »

According to A-Z animals, barnacles are primarily filter feeders that collect microscopic particles of food from the water column. These food particles can be comprised of plankton or bits of organic debris. More »

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