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Question


Which of the following organisms does not possess a circulatory system?


Options:
A .   Hydra 
B .   Sponges 
C .   Humans 
D .   Birds
Answer: Option A
:
A and B
Animals such as hydra and sponges do not posses a circulatory system. The water in which they live, brings in food and oxygen as they enter their bodies. When this water moves out of the body, it carries away waste materials and carbon dioxide away from the body. 

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