why do animals like sponges and Hydra do not have blood?
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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. ... Thus, these animals do not need a circulatory fluid like the blood.
mrgamerpro12:
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the oxygen and water required by themdo not require circulatory system as they live in water it reaches the body by osmoises or diffusion
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