Sponge and Hydra structure is not complicated, nearly all cells in contact with the water directly.). Waste diffusion through cell membranes in the form of ammonia. For the tissue Hydra lining the interior will excrete waste through cell membranes. Come together in gastrovascular then excreted in the mouth.Sponge waste will be eliminated out of the cell membrane or the wall of the body.Hydra can be removed through the mouth or through the skin.
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