(A) Sponges belong to the phylum Porifera. They lack specialized respiratory organs. The exchange of gases ($O_2$ and $CO_2$) in sponges occurs throug

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simple diffusion over their entire body surfaces

(A) Sponges belong to the phylum Porifera. They lack specialized respiratory organs. The exchange of gases ($O_2$ and $CO_2$) in sponges occurs through the process of simple diffusion across their entire body surface, which is in direct contact with the surrounding water.