Polyp

Hydra are diploblastic, i.e. they have only two cell layers. Respiration is by simple diffusion.

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How does a polyp respire? Couldn't find any answer in the internet...

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... this immortal being so small hehe : Turritopsis nutricula or immortal jellyfish is a hydrozoan whose medusa, or jellyfish, form can revert to the polyp stage after becoming sexually mature. It is the only known case of a metazoan capable of reverting completely to a sexually immature, colonial ...

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... this is one of them: What is "The use" of a swimming stadium among Cnidaria (and also swamps) ? I think the answear is that becouse of a polyp- colony is single- sexual, they have to produse medusa, if they want to get some kind of gentic variation. Am i getting this right, or can somone ...

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What was the size of the polyp, >10mm ? If so I would wonder why this did not raise concerns with the doctors. Although I think this is unrelated to any change in body size, It might cause the severe pains which prompted you to visit ...

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