Sponges and hydra have circulatory system . Explain
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Sponges and hydra have circulatory system . Explain
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Answer:
Animals such as sponges and Hydra do not posses any circulatory system. The water in which they live brings food and oxygen as it enters their bodies. The water carries away waste materials and carbon dioxide as it moves out. Thus, these animals do not need a circulatory fluid like the blood.