Im perplexed by the real questions

clearly the solution for the butthole is cloaca

I think it depends on the kind of tail tbh

2!!!!!!!!

As a fish, I think it would be the 2nd one

aquatic mammals also use the "fish" placement

I have thought about the genitals but the butthole placement brings up a valid point....I think 2, but for my sanity I would swap the butthole and the genitals bc gravity (I know they're in water but listen) makes me think like ....poopy on their thingaling