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Description
Many species are in many ways similar to terrestrial animals, with the only difference that not even everyone knows where they have what. In some species, the siphon and mouth swapped places, while in others the siphon could atrophy or take a more habitual position on the body (either sideways in the form of paired or non-paired holes, or at the end of the body). This is due to many habitats and ecological niches. For some species, it is much easier to grab and digest food, I apologize, through the anus, while for others it is easier to get rid of it, since the food itself can leave through the mouth without harm to the host (or through special pores that have formed independently in different lines).
In general, no matter how they look like terrestrial animals, the anatomy of their internal organs is much crazier.

Description
Many species are in many ways similar to terrestrial animals, with the only difference that not even everyone knows where they have what. In some species, the siphon and mouth swapped places, while in others the siphon could atrophy or take a more habitual position on the body (either sideways in the form of paired or non-paired holes, or at the end of the body). This is due to many habitats and ecological niches. For some species, it is much easier to grab and digest food, I apologize, through the anus, while for others it is easier to get rid of it, since the food itself can leave through the mouth without harm to the host (or through special pores that have formed independently in different lines).
In general, no matter how they look like terrestrial animals, the anatomy of their internal organs is much crazier.