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Pogonophores (deep sea vent worms) lack a digestive tract because of symbiotic chemosynthetic bacteria. Same with tapeworms because of their parasitic lifestyle. Lots of examples in parasitology.

Can you cite a journal article or a study, published or unpublished, that has explained, in detail, how the vent worms were formed by RM/NS from some organism that had a digestive tract? Or any of the examples you cite?

Isn't it true that the literature is replete with speculation on what may have happened, but nothing that would constitute a detailed explanation?

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