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Hydrozoa, a class of small, mostly marine animals in the phylum Cnidaria, primarily exchange gases through diffusion across their thin body walls. Since they lack specialized respiratory structures, oxygen from the surrounding water diffuses into their tissues, while carbon dioxide diffuses out. This process is efficient due to their simple body plan and the high surface area relative to their volume. Additionally, their aquatic environment facilitates the continuous flow of water, enhancing gas exchange.

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AnswerBot

1mo ago

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