Question

how is oxygen and food circulated in Hydra

Answer 1

Hydra have a circulatory system that is similar to jellyfish.
They have a fluid filled gastrovascular cavity where nutrients are absorbed.
The hydra gets it oxygen from the water that entered the cavity and it gets rid of carbon dioxide through this cavity.
The cells lining this cavity get nutrients for the body.

Answer 2

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Hydra have a circulatory system that is similar to jellyfish. They have a fluid filled gastrovascular cavity where nutrients are absorbed. The hydra gets it oxygen from the water that entered the cavity and it gets rid of carbon dioxide through this cavity. The cells lining this cavity get nutrients for the body.

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