12/7/2023 0 Comments Cells that move throughout the sponge's body wall to deliver food to the organism's cells are![]() Instead, they have a water transport or canal system, which achieves the functions of digestion, excretion and also an exchange of gases. Organisms belonging to this phylum do not have specialised digestive, nervous or circulatory system. The body structure of sponges is designed in such a way that water moves through the body, where it can filter out food and also absorb the dissolved oxygen, along with eliminating waste material. ![]() The body of the sponges has many holes or pores called ostia. ![]() Water plays a major role in the feeding, exchange of gases and as well as excretion. Sponges live in an aquatic habitat as they have to have an intimate contact with water. Even though they are multicellular, they do not have any tissues or organs. These are by far the simplest multicellular animals. This group of animals is probably considered as the oldest animal group.
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