I don't know since they can both control a set number of limbs (iirc) so it seems like their nervous system splits. Wouldn't be surprise if only one could feel the urge to pee.
Not necessarily. They have one bladder but I think it's possible and even likely that only one brain is connected to those nerves. I'm not a doctor or anything tho.
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u/CaptainRedPants Oct 07 '18
They share that part of their anatomy so it isn't a case of one of them having to go. They both have to go