Why do hydra and sponges do not possess any circulatory system for?
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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.
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Answer:
They are simple lower and small
organism with no organs
Explanation:
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