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nephridia
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Tapeworms have skin, intestines and reproductive organs. They are very simple creatures unlike the earthworm. Earthworms have a brain, Aortic arches, a clitellum, segments, intestines, reproductive organs, a crop, gizzard, Dorsal nerve cord, Cuticle (skin) satae, mouth and anus.
No, but hannah smith is a simple organism.
The space is called the coelum, and provides cushioning of the digestive system in earthworms and some other simple animals. It allows the organs to function independently of the external structures.
earthworms
That system is called as integumentary system. in simple word it is called as skin.
Its going to be a.gills
I am pretty sure they have simple but very complex digestive systems
yes,simple multicellular organism can be without organ.e.g sponges