Answer :
Sponges are one of the simplest multicellular organisms on earth. Yes, sponges are considered animals, not plants. But they grow, reproduce and survive just like plants. They have no central nervous system, no digestive system, no circulatory system, and no organs!
But they are very simple creatures. Sponges have no respiratory, digestive, or circulatory system. Instead, sponges rely on the flow of water through their bodies to carry food and oxygen and carry away waste products.
When the sponge pumps water into the body, water rich in nutrients and oxygen flows over the cells. Oxygen diffuses into the cells and waste products such as carbon dioxide leave the cells. The body of the sponge is hollow, composed primarily of collagen, and held in shape by memoir, a jelly-like substance strengthened by a dense network of fibers also composed of collagen. , covered by cells with a cylindrical or conical collar surrounding one flagellum per choanocyte.
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